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tensile elastic modulus, Strength and Fracture of δ-Al_2O_(3f)/Al Alloy Composites

Journal of Materials Science & Technology 2000年第5期16卷 475-480页

作者： GuoZheng KANG+, Qing GAO and Jixi ZHANG (Department of Applied Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China) Department of Applied Mechanics and Engineering Southwest Jiaotong University Chengdu 610031 China

Based on the experimental and theoretical analysis, the tensile elastic modulus, strength and fracture characteristics of squeeze casting δ-Al2O3/Al alloy composites were studied. The fracture characteristics of composites were observed by SEM. The elastic modulus was predicted by the finite element method based on the energy equivalence principle, and the strength was predicted by the statistical integration average method using the maximum energy criterion of composite strength. In the prediction, the distribution density functions of the fiber's. orientation and length were considered. These functions were gained by experimental measurement. It is shown that the predicted results are in agreement with the experimental values well and the microstructure feature of composites controls the fracture characteristics.

关键词： tensile elastic modulus Al2O

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Numerical analysis of bending property of bi-modulus materials and a new method for measurement of tensile elastic modulus

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第10期15卷 2539-2555页

作者： Tianmin Wang Jianhong Ye State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China University of Chinese Academy of Sciences Beijing100049China

In nature,there are widely distributed bi-modulus materials with different deformation characteristics under compressive and tensile stress states,such as concrete,rock and *** to the lack of constitutive model that could reasonably consider the bi-modulus property of materials,and the lack of simple and reliable measurement methods for the tensile elastic parameters of materials,scientists and engineers always neglect the effect of the bi-modulus property of materials in engineering design and numerical *** solve this problem,this study utilizes the uncoupled strain-driven constitutive model proposed by Latorre and Montáns(2020)to systematically study the distributions and magnitudes of stresses and strains of bi-modulus materials in the three-point bending test through the numerical ***,a new method to synchronously measure the tensile and compressive elastic moduli of materials through the four-point bending test is *** numerical results show that the bi-modulus property of materials has a significant effect on the stress,strain and displacement in the specimen utilized in the three-point and four-point bending ***,the results from the numerical tests,in which the elastic constitutive model proposed by Latorre and Montáns(2020)is utilized,also indicate that the newly proposed measurement method has a good *** the new measurement method proposed in this study can synchronously and effectively measure the tensile and compressive elastic moduli,it cannot measure the tensile and compressive Poisson’s ratios.

关键词： Bi-modulus material Uncoupled strain-driven constitutive model Three-point bending test Four-point bending test tensile elastic modulus FssiCAS

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