Failure of hybrid composites under longitudinal tension: Influence of dynamic effects and thermal residual stresses

2020 ◽  
Vol 233 ◽  
pp. 111732 ◽  
Author(s):  
Jose M. Guerrero ◽  
Joan A. Mayugo ◽  
Josep Costa ◽  
Albert Turon
Keyword(s):  
Residual Stresses ◽  
Hybrid Composites ◽  
Dynamic Effects ◽  
Thermal Residual Stresses ◽  
Longitudinal Tension

Effect of Thermal Residual Stress on the Mechanical Properties of NiAl-Based Composites

1998 ◽  
Vol 552 ◽  
Author(s):  
Hahn Choo ◽  
Mark Bourke ◽  
Philip Nash
Keyword(s):  
Residual Stress ◽  
Yield Strength ◽  
Residual Stresses ◽  
Room Temperature ◽  
Hybrid Composites ◽  
Thermal Residual Stress ◽  
Volume Percent ◽  
Linear Superposition ◽  
Thermal Residual Stresses ◽  
Good Agreement

ABSTRACTNiAl-based hybrid composites containing 5, 15 and 30 volume percent of A12O3 fibers in addition to AIN dispersion particles were fabricated via a powder metallurgy route. The strengthening mechanisms associated with the short A12O3 fiber in NiAl-(A1N)dispersion,-(A12O3)fiber, composite were studied with an emphasis on the effect of thermal residual stress on the compressive strength at room temperature and 1300K. At 300K, the yield strength of the composites was predicted using a linear superposition of the monolithic yield strength, direct fiber strengthening and tensile matrix residual stresses. The prediction shows good agreement with the measured data. The majority of the room temperature strengthening is attributable to the residual stress. At 1300K, the strengthening was achieved only by the load sharing of the fibers and there is no direct influence from the process-induced thermal residual stresses since they were completely relaxed at this temperature.

Finite Element Analysis of the Thermal Residual Stresses of Diamond Cutting Tools in the Sintering Process

2008 ◽  
Vol 587-588 ◽  
pp. 695-699 ◽  
Author(s):  
Luís G. Reis ◽  
Pedro M. Amaral ◽  
Bin Li ◽  
Carlos A. Anjinho ◽  
Luís Guerra Rosa ◽  
...  
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Diamond Tool ◽  
Diamond Particle ◽  
Elastic Behaviour ◽  
Tensile Behaviour ◽  
Sintering Process ◽  
Element Analysis ◽  
Elastic Plastic ◽  
Thermal Residual Stresses

The main objective of the present work is to present and discuss the effects of the residual stresses generated in the matrix. Both, elastic and elastic-plastic models using explicit finite element code Abaqus were developed to investigate the thermal residual stresses generated around a diamond particle embedded in a metal matrix (a binder) during the sintering process for obtaining a diamond tool. The first part of the work consists in examining the thermal residual stress field generated by using three sintering temperatures from which the bodies are cooled from (T1=800°C, T2=700°C and T3=600°C) and two diamond shapes modelled with 2D axisymmetric elements, one from a circle the other from an octagon, respectively. In this case only one type of binder showing typical elastic behaviour is considered. The second part of this work consists in comparing the finite element solutions using binders with different tensile behaviour (elastic vs. elastic-plastic behaviour). This last study has used a particle shape generated from the octagon, since this shape allows, in a great number of real situations, the simulation of a particle with a larger number of facets, in line with what it is observed when looking at a conventional diamond tool.

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