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< Page ,Total 146 >
FRACTURE-TOUGHNESS EVALUATION FOR SHORT GLASS-FIBER REINFORCED COMPOSITES SCIE
期刊论文 | 1991 , 26 (24) , 6553-6564 | JOURNAL OF MATERIALS SCIENCE
WoS CC Cited Count: 1
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Abstract :

Valid plane-stress fracture toughness evaluation of short fibre reinforced composites relies essentially on the successful separation of the energy absorbed in the localized crack-tip region out of the total energy absorbed by the cracked material body at large. Three different experimental techniques, all stemming from the energetic interpretation of the J integral, are utilized and their relative merits in the characterization of fracture initiation in short glass fibre reinforced injection-moulded nylon 6.6 examined. Various theoretical aspects concerning these experimental methods are outlined. The rationale behind using a single-edge-notched tension type specimen for the J(c) test is presented. The J(c) value obtained from the compliance calibration method and the quasistatic energy method agree closely and can be considered to be independent of pre-crack length and specimen geometry when the pre-crack length to specimen width ratio (a/w) is larger than 0.45. The extrapolation method fails nevertheless to yield a physically consistent J(c) value, possibly due to its questionable theoretical representation. As no constraint on boundary conditions is necessitated during the course of crack extension, the quasistatic energy is physically more appealing.

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GB/T 7714 CHOW, CL , LU, TJ . FRACTURE-TOUGHNESS EVALUATION FOR SHORT GLASS-FIBER REINFORCED COMPOSITES [J]. | JOURNAL OF MATERIALS SCIENCE , 1991 , 26 (24) : 6553-6564 .
MLA CHOW, CL 等. "FRACTURE-TOUGHNESS EVALUATION FOR SHORT GLASS-FIBER REINFORCED COMPOSITES" . | JOURNAL OF MATERIALS SCIENCE 26 . 24 (1991) : 6553-6564 .
APA CHOW, CL , LU, TJ . FRACTURE-TOUGHNESS EVALUATION FOR SHORT GLASS-FIBER REINFORCED COMPOSITES . | JOURNAL OF MATERIALS SCIENCE , 1991 , 26 (24) , 6553-6564 .
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BALL ALGORITHMS FOR CONSTRUCTING SOLUTIONS OF NONLINEAR OPERATOR-EQUATIONS SCIE Scopus
期刊论文 | 1991 , 38 (1-3) , 457-471 | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
WoS CC Cited Count: 3
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Abstract :

In the most general setting we extend the previous theory of the region contraction algorithm developed recently by several authors for solving nonlinear operator equations. It is demonstrated that the extended algorithm still possesses properties such as generating error bounds automatically, providing a computational test for the existence of solutions and being globally convergent under nominal conditions. As examples of applications, we specialize the extended theory in particular to nonlinear operator equations of monotone type.

Keyword :

BALL ALGORITHM REGION CONTRACTION ALGORITHM COMPUTATIONAL TEST FOR EXISTENCE NONLINEAR OPERATORS OF MONOTONE TYPE

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GB/T 7714 YOU, ZY , XU, ZB . BALL ALGORITHMS FOR CONSTRUCTING SOLUTIONS OF NONLINEAR OPERATOR-EQUATIONS [J]. | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , 1991 , 38 (1-3) : 457-471 .
MLA YOU, ZY 等. "BALL ALGORITHMS FOR CONSTRUCTING SOLUTIONS OF NONLINEAR OPERATOR-EQUATIONS" . | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 38 . 1-3 (1991) : 457-471 .
APA YOU, ZY , XU, ZB . BALL ALGORITHMS FOR CONSTRUCTING SOLUTIONS OF NONLINEAR OPERATOR-EQUATIONS . | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , 1991 , 38 (1-3) , 457-471 .
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PCG METHODS APPLIED TO A SYSTEM OF NONLINEAR EQUATIONS SCIE Scopus
期刊论文 | 1991 , 38 (1-3) , 61-75 | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS
WoS CC Cited Count: 1
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Abstract :

In this paper, we consider a quasi-Newton iteration for solving a nonlinear equation F(x) = Ax + g(x) = 0 in R(n), where A is a symmetric positive definite matrix and g is a bounded continuous function. We discuss the PCG method with various preconditioners to solve the linear equation at each step of the iteration, estimate their condition numbers, and compare their computing time for a numerical example.

Keyword :

NEWTON-LIKE METHOD NONLINEAR EQUATIONS PCG METHOD

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GB/T 7714 CHEN, XJ , YAMAMOTO, T . PCG METHODS APPLIED TO A SYSTEM OF NONLINEAR EQUATIONS [J]. | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , 1991 , 38 (1-3) : 61-75 .
MLA CHEN, XJ 等. "PCG METHODS APPLIED TO A SYSTEM OF NONLINEAR EQUATIONS" . | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS 38 . 1-3 (1991) : 61-75 .
APA CHEN, XJ , YAMAMOTO, T . PCG METHODS APPLIED TO A SYSTEM OF NONLINEAR EQUATIONS . | JOURNAL OF COMPUTATIONAL AND APPLIED MATHEMATICS , 1991 , 38 (1-3) , 61-75 .
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MEASUREMENT OF DROPLET SIZE DISTRIBUTION IN A 2-PHASE MEDIUM BY OPTIMIZED METHOD OF LASER SCATTERING EI SCIE Scopus
期刊论文 | 1991 , 12 (1) , 85-88 | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

This article describes a method of measuring the size distributions of suspensions of spherical particles such as are found in low-pressure stages of wet steam turbines using optical instruments incorporating a He-Ne laser beam. The upper limit distribution function (ULDF) was used to optimize distribution parameter values. In the design of the experimental system, an anti-Gaussian filter is used to eliminate the effect of the Gaussian beam, and a Fourier lens of high precision is applied to eliminate the spherical aberration. In addition, a photosensitive detector is devised as a unit to receive the power spectrum of scattered light. This apparatus is calibrated by directly measuring the diameters of glass beads suspended in water. The results are compared with those obtained by microphotographic statistics and with those obtained by using a Malvern instrument. The experimental results indicate that this light scattering apparatus is more precise than the Malvern apparatus and has a wider range of particle size (5-200-mu-m) measurement.

Keyword :

2-PHASE FLOW LASER DEVICE OPTICAL ABSORPTION AND SCATTERING

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GB/T 7714 HU, ZG , TSAI, YN , SHENG, DR . MEASUREMENT OF DROPLET SIZE DISTRIBUTION IN A 2-PHASE MEDIUM BY OPTIMIZED METHOD OF LASER SCATTERING [J]. | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW , 1991 , 12 (1) : 85-88 .
MLA HU, ZG 等. "MEASUREMENT OF DROPLET SIZE DISTRIBUTION IN A 2-PHASE MEDIUM BY OPTIMIZED METHOD OF LASER SCATTERING" . | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW 12 . 1 (1991) : 85-88 .
APA HU, ZG , TSAI, YN , SHENG, DR . MEASUREMENT OF DROPLET SIZE DISTRIBUTION IN A 2-PHASE MEDIUM BY OPTIMIZED METHOD OF LASER SCATTERING . | INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW , 1991 , 12 (1) , 85-88 .
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SLIDING WEAR AND FRETTING FATIGUE RESISTANCE OF AMORPHOUS NI-P COATINGS EI SCIE Scopus
期刊论文 | 1991 , 142 (2) , 291-301 | WEAR
WoS CC Cited Count: 15 SCOPUS Cited Count: 18
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Abstract :

In this paper, methods of obtaining and evaluating amorphous Ni-P coatings are introduced. The sliding wear and fretting fatigue resistance of amorphous Ni-P coatings are investigated. Ni-P coatings remarkably increase the sliding wear resistance of chilled cast iron and the fretting fatigue resistance of low strength steel (2Cr13) and middle strength steel (35CrMo), but decrease the fretting fatigue resistance of high strength steel (60Si2Mn). Scanning electron micrographs show that Ni-P coatings modify the tribobehaviour of the surfaces of low and middle strength steel specimens under fretting fatigue conditions.

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GB/T 7714 GAO, HS , GU, HC , ZHOU, HJ . SLIDING WEAR AND FRETTING FATIGUE RESISTANCE OF AMORPHOUS NI-P COATINGS [J]. | WEAR , 1991 , 142 (2) : 291-301 .
MLA GAO, HS 等. "SLIDING WEAR AND FRETTING FATIGUE RESISTANCE OF AMORPHOUS NI-P COATINGS" . | WEAR 142 . 2 (1991) : 291-301 .
APA GAO, HS , GU, HC , ZHOU, HJ . SLIDING WEAR AND FRETTING FATIGUE RESISTANCE OF AMORPHOUS NI-P COATINGS . | WEAR , 1991 , 142 (2) , 291-301 .
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COMMENTS ON TE AND TM MODES OF SOME TRIANGULAR CROSS-SECTION WAVE-GUIDES USING SUPERPOSITION OF PLANE-WAVES SCIE
期刊论文 | 1991 , 39 (3) , 612-613 | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
WoS CC Cited Count: 10
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GB/T 7714 ZHANG, JG , FU, JM . COMMENTS ON TE AND TM MODES OF SOME TRIANGULAR CROSS-SECTION WAVE-GUIDES USING SUPERPOSITION OF PLANE-WAVES [J]. | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES , 1991 , 39 (3) : 612-613 .
MLA ZHANG, JG 等. "COMMENTS ON TE AND TM MODES OF SOME TRIANGULAR CROSS-SECTION WAVE-GUIDES USING SUPERPOSITION OF PLANE-WAVES" . | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 39 . 3 (1991) : 612-613 .
APA ZHANG, JG , FU, JM . COMMENTS ON TE AND TM MODES OF SOME TRIANGULAR CROSS-SECTION WAVE-GUIDES USING SUPERPOSITION OF PLANE-WAVES . | IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES , 1991 , 39 (3) , 612-613 .
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CONDUCTION MECHANISMS IN EPOXY-RESIN SYSTEMS - INFLUENCE OF GAMMA-IRRADIATION SCIE
期刊论文 | 1991 , 37 (4) , 589-597 | RADIATION PHYSICS AND CHEMISTRY
WoS CC Cited Count: 8
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Abstract :

Studies of gamma-irradiation to dose levels of 2 MG(g) of two epoxy resin systems have been undertaken. Using both thermally stimulated current measurements and d.c. current measurements, changes in the polymer structure and conduction processes were identified. The conduction process in both cases were found to be ionic as shown by the linear current-voltage characteristics. This behaviour occurred over a temperature range of approximately 120-degrees-C. From this data activation energies of 0.9 and 2.16 eV were obtained for the two resin systems. In addition ion jump distances were found to be of the order of 10(-8) m, as derived from deviation from Ohmic behaviour under high field conditions. In the case of one resin this deviation occurred at appreciably lower applied fields and was attributed to homo-charge injection from the electrodes. The other resin showed some space charge effects in the thermally stimulated discharge spectrum. gamma-Irradiation effects caused in one system a lowering of T(g) with an increase in d.c. conductivity which were both affected by post irradiation annealing. The causes were attributed to ion production and chain scission during irradiation. The other resin system exhibited an increase in T(g) and a decrease in conductivity, these effects being attributed to radiation-induced crosslinking.

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GB/T 7714 FOURACRE, RA , BANFORD, HM , TEDFORD, DJ et al. CONDUCTION MECHANISMS IN EPOXY-RESIN SYSTEMS - INFLUENCE OF GAMMA-IRRADIATION [J]. | RADIATION PHYSICS AND CHEMISTRY , 1991 , 37 (4) : 589-597 .
MLA FOURACRE, RA et al. "CONDUCTION MECHANISMS IN EPOXY-RESIN SYSTEMS - INFLUENCE OF GAMMA-IRRADIATION" . | RADIATION PHYSICS AND CHEMISTRY 37 . 4 (1991) : 589-597 .
APA FOURACRE, RA , BANFORD, HM , TEDFORD, DJ , CAO, X , GEDEON, S . CONDUCTION MECHANISMS IN EPOXY-RESIN SYSTEMS - INFLUENCE OF GAMMA-IRRADIATION . | RADIATION PHYSICS AND CHEMISTRY , 1991 , 37 (4) , 589-597 .
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BIFURCATIONS OF A SIMPLIFIED BUCKLING PROBLEM AND THE EFFECT OF DISCRETIZATIONS SCIE Scopus
期刊论文 | 1991 , 71 (3) , 225-252 | MANUSCRIPTA MATHEMATICA
WoS CC Cited Count: 11 SCOPUS Cited Count: 13
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Keyword :

PRIMARY BRANCH SECONDARY BIFURCATION CORANK-M BIFURCATION POINT MODIFIED LYAPUNOV-SCHMIDT METHOD 5-POINT DIFFERENCE SCHEME

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GB/T 7714 MEI, Z . BIFURCATIONS OF A SIMPLIFIED BUCKLING PROBLEM AND THE EFFECT OF DISCRETIZATIONS [J]. | MANUSCRIPTA MATHEMATICA , 1991 , 71 (3) : 225-252 .
MLA MEI, Z . "BIFURCATIONS OF A SIMPLIFIED BUCKLING PROBLEM AND THE EFFECT OF DISCRETIZATIONS" . | MANUSCRIPTA MATHEMATICA 71 . 3 (1991) : 225-252 .
APA MEI, Z . BIFURCATIONS OF A SIMPLIFIED BUCKLING PROBLEM AND THE EFFECT OF DISCRETIZATIONS . | MANUSCRIPTA MATHEMATICA , 1991 , 71 (3) , 225-252 .
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LONG-TIME BEHAVIOR OF FIELD FLUCTUATION IN THE M-PHOTON JAYNES-CUMMINGS MODEL SCIE Scopus
期刊论文 | 1991 , 84 (2) , 329-331 | ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER
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Abstract :

In this paper we study the field fluctuation in the M-photon Jaynes-Cummings model. We present the general expression for the field fluctuation and put emphasis on the long time behavior. We find that the field squeezing seems to appear periodically for even-photon processes, but only exists in the initial short time for odd-photon processes. We also find that the field fluctuation shows collapse-revival-like phenomena in the long-time and no-squeezing region for odd-photon processes.

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GB/T 7714 ZHANG, ZM , XU, L , LI, FL et al. LONG-TIME BEHAVIOR OF FIELD FLUCTUATION IN THE M-PHOTON JAYNES-CUMMINGS MODEL [J]. | ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER , 1991 , 84 (2) : 329-331 .
MLA ZHANG, ZM et al. "LONG-TIME BEHAVIOR OF FIELD FLUCTUATION IN THE M-PHOTON JAYNES-CUMMINGS MODEL" . | ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER 84 . 2 (1991) : 329-331 .
APA ZHANG, ZM , XU, L , LI, FL , CHAI, JL . LONG-TIME BEHAVIOR OF FIELD FLUCTUATION IN THE M-PHOTON JAYNES-CUMMINGS MODEL . | ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER , 1991 , 84 (2) , 329-331 .
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EFFECT OF STRESS TRIAXIALITY LEVELS IN CRACK TIP REGIONS ON THE CHARACTERISTICS OF VOID GROWTH AND FRACTURE CRITERIA EI SCIE Scopus
期刊论文 | 1991 , 39 (6) , 1051-+ | ENGINEERING FRACTURE MECHANICS
WoS CC Cited Count: 10
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The behaviour of void growth in the crack tip regions of four specimen geometries with different stress triaxiality levels have been investigated by the FEM method and experimental observations in plane strain and plane stress cases respectively. It was found that the shape change of growing voids, the configurations of a blunting crack tip and the sizes of decreasing ligament between the void and the crack tip are strongly dependent upon the stress triaxiality levels. Under the condition of plane stress, the stress triaxiality on the ligaments of cracks are nearly the same for different specimen geometries, also the void growth, crack tip blunting and decreasing of ligament size are identical for various specimens with increasing load levels, which lead to the conclusion that the J(i)-value is independent of specimen geometries. However, in the plain strain case, different void growth, crack tip blunting and decreasing in ligament size for various stress triaxiality levels directly caused the J(i)-value to be dependent on the specimen geometries. It was found that when the void is linked to the blunting crack tip by the extrapolation to the zero ligament from FEM calculations, the J(i) values, measured experimentally, are underestimated slightly.

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GB/T 7714 JUN, S , DENG, ZJ , TU, MJ . EFFECT OF STRESS TRIAXIALITY LEVELS IN CRACK TIP REGIONS ON THE CHARACTERISTICS OF VOID GROWTH AND FRACTURE CRITERIA [J]. | ENGINEERING FRACTURE MECHANICS , 1991 , 39 (6) : 1051-+ .
MLA JUN, S et al. "EFFECT OF STRESS TRIAXIALITY LEVELS IN CRACK TIP REGIONS ON THE CHARACTERISTICS OF VOID GROWTH AND FRACTURE CRITERIA" . | ENGINEERING FRACTURE MECHANICS 39 . 6 (1991) : 1051-+ .
APA JUN, S , DENG, ZJ , TU, MJ . EFFECT OF STRESS TRIAXIALITY LEVELS IN CRACK TIP REGIONS ON THE CHARACTERISTICS OF VOID GROWTH AND FRACTURE CRITERIA . | ENGINEERING FRACTURE MECHANICS , 1991 , 39 (6) , 1051-+ .
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