The indentation of hard metals: the role of residual stresses

1977 ◽  
Vol 12 (2) ◽  
pp. 215-218 ◽  
Author(s):  
C. J. Studman ◽  
J. E. Field
Keyword(s):  
Residual Stresses ◽  
Hard Metals

Critical role of scan strategies on the development of microstructure, texture, and residual stresses during laser powder bed fusion additive manufacturing

2021 ◽  
Vol 38 ◽  
pp. 101792
Author(s):  
Naresh Nadammal ◽  
Tatiana Mishurova ◽  
Tobias Fritsch ◽  
Itziar Serrano-Munoz ◽  
Arne Kromm ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Residual Stresses ◽  
Critical Role ◽  
Powder Bed Fusion ◽  
Laser Powder Bed Fusion ◽  
Powder Bed

scholarly journals Geometrical behavior of laminated graphite/epoxy composite using hypermesh

2018 ◽  
Vol 7 (2.20) ◽  
pp. 214
Author(s):  
Ch Siva RamaKrishna ◽  
KV Subba Rao ◽  
Saineelkamal Arji
Keyword(s):  
Residual Stresses ◽  
Epoxy Composite ◽  
Weight Ratio ◽  
Laminated Composite ◽  
High Strength ◽  
Element Analysis ◽  
Aspect Ratios ◽  
Military Applications ◽  
Inherent Strength

The laminated composite material is  made of ply which are specically used in automotive, aerospace and military applications due to less in weight and high strength to weight ratio. The role of structural strength is very important in composites, as the material is weak in inherent strength leads to damage of equipment made with the laminated composite. Hence, an accurate understanding of their structural geometrical behavior for residual stresses is required, such as residual stresses with different aspect ratios. In present work, various aspect ratios of laminated composite and its residual stresses are investigated using finite element analysis. The numerical results showed, on the residual stresses, that the effects the change the residual stresses due change of aspect ratio of laminated Graphite/epoxy composite. 

Lifetime Assessment of Particulate Ceramic Composite with Residual Stresses

2017 ◽  
Vol 754 ◽  
pp. 107-110
Author(s):  
Luboš Náhlík ◽  
Zdeněk Majer ◽  
Kateřina Štegnerová ◽  
Pavel Hutař
Keyword(s):  
Residual Stresses ◽  
Crack Propagation ◽  
Mechanical Loading ◽  
Ceramic Composite ◽  
Subcritical Crack Growth ◽  
Particulate Composites ◽  
Time To Failure ◽  
Complex Load ◽  
Composite Surface

A micro-crack propagation in particulate ceramic based composite was studied using finite element method (FEM). Subcritical crack growth (SCG) was numerically simulated under complex load conditions (mechanical loading and loading by internal residual stresses). The effect of residual stresses on the crack propagation was studied. Two-dimensional computational model of particulate ceramic composite with material properties corresponding to low temperature co-fired ceramics (LTCC) was developed. The results indicate that the presence of residual stresses significantly reduces values of stress intensity factor in the vicinity of composite surface and the direction of residual stresses around the particles contributes to the micro-crack deflection from the particles. The time to failure of the composite under mechanical loading was determined. Results obtained contribute to a better understanding of the role of residual stresses during micro-crack propagation in ceramic particulate composites.

Viscoplastic Buckling of Silicon Ribbon

1987 ◽  
Vol 54 (3) ◽  
pp. 563-570 ◽  
Author(s):  
C. T. Tsai ◽  
O. W. Dillon
Keyword(s):  
Residual Stresses ◽  
Response Function ◽  
Growth Direction ◽  
Viscoplastic Material ◽  
Material Response ◽  
Lateral Deflection ◽  
Buckling Behavior ◽  
Silicon Ribbon ◽  
Creep Buckling

Silicon ribbon grown by the dendritic web process passes through a rapidly changing thermal profile in the growth direction. This rapidly changing profile induces stresses which cause buckling. Based on a viscoplastic material response function (Haasen-Sumino model), the creep buckling behavior of the silicon ribbon is investigated. The lateral deflection speeds describing the viscoplastic buckling behavior are calculated. It is found that the deflections of some modes increase with time while others die out. The role of the residual stresses in viscoplastic buckling is examined.

Effects of Nano-Al2O3 Additions on Microstructures and Properties of WC-8Co Hard Metals

2010 ◽  
Vol 97-101 ◽  
pp. 1649-1652 ◽  
Author(s):  
Lan Sun ◽  
Ji Xiong ◽  
Zhi Xing Guo
Keyword(s):  
Mechanical Properties ◽  
Magnetic Properties ◽  
Coercive Force ◽  
Rupture Strength ◽  
Al2o3 Content ◽  
Al2o3 Nanoparticles ◽  
Magnetic Intensity ◽  
Hard Metals ◽  
Conventional Sintering

To investigate the role of nano-Al2O3, WC–Al2O3–8wt%Co hard metals was mixed with 0-1.2 wt% nano-Al2O3 and prepared by conventional sintering (CS) for 2 h at 1440°C to see whether the addition of Al2O3 could improve densification behaviour, the microstructure and mechanical properties of the samples. The results showed that the use of Al2O3 nanoparticles as dispersions could reduce the porosity of WC-Co alloy and decrease the relative density; it could also inhibit the growth of the grains of WC-Co hardmetal to enhance the hardness and transverse rupture strength of the alloy in a proper range. The influence of Al2O3 content on the magnetic properties including coercive force and saturated magnetic intensity of the WC–Al2O3–8wt%Co hardmetals manifested the additive of nano-Al2O3 have effect on the WC grain growth inhibition and the formation of decarbonization phase in the alloy.

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