Elastic-Plastic Response of Sintered Porous Iron Under Uniaxial Strain Cycling

1993 ◽  
Vol 115 (1) ◽  
pp. 89-94 ◽  
Author(s):  
K. T. Kim ◽  
Y. S. Kwon
Keyword(s):  
Constitutive Equations ◽  
Uniaxial Strain ◽  
Porous Iron ◽  
Plastic Response ◽  
Elastic Plastic ◽  
Plastic Responses ◽  
Theoretical Results ◽  
Strain Cycling ◽  
Cyclic Data

Elastic-plastic responses of porous iron under uniaxial strain cycling between two fixed values of strain are investigated. A special set of constitutive equations is formulated by including isotropic, kinematic and saturation hardening responses. The theoretical results from the constitutive equations are compared with experimental cyclic data for porous iron, with various porosities.

Strain Hardening Response of Sintered Porous Iron Tubes With Various Initial Porosities Under Combined Tension and Torsion

1992 ◽  
Vol 114 (2) ◽  
pp. 213-217 ◽  
Author(s):  
K. T. Kim ◽  
Y. S. Kwon
Keyword(s):  
Experimental Data ◽  
Plastic Strain ◽  
Strain Hardening ◽  
Constitutive Equations ◽  
Yield Function ◽  
Porous Iron ◽  
Constitutive Theories ◽  
Elastic Plastic ◽  
Theoretical Predictions

Elastic-plastic strain hardening responses of sintered porous iron are investigated. By using the yield function of Kim, two sets of constitutive equations are obtained from the constitutive theories by Kim and Suh and by Gurson. Theoretical predictions from these constitutive equations are compared with experimental data for sintered porous iron tubes with various initial porosities under combined tension and torsion.

scholarly journals The genetics of morphological and behavioural island traits in deer mice

2019 ◽  
Vol 286 (1914) ◽  
pp. 20191697 ◽  
Author(s):  
Felix Baier ◽  
Hopi E. Hoekstra
Keyword(s):  
Genetic Basis ◽  
Genetic Effect ◽  
Deer Mice ◽  
Plastic Response ◽  
Common Environment ◽  
Environmental Extremes ◽  
Laboratory Colonies ◽  
Island Syndrome ◽  
Heritable Change ◽  
Plastic Responses

Animals on islands often exhibit dramatic differences in morphology and behaviour compared with mainland individuals, a phenomenon known as the ‘island syndrome’. These differences are thought to be adaptations to island environments, but the extent to which they have a genetic basis or instead represent plastic responses to environmental extremes is often unknown. Here, we revisit a classic case of island syndrome in deer mice ( Peromyscus maniculatus ) from British Columbia. We first show that Saturna Island mice and those from neighbouring islands are approximately 35% (approx. 5 g) heavier than mainland mice and diverged approximately 10 000 years ago. We then establish laboratory colonies and find that Saturna Island mice are heavier both because they are longer and have disproportionately more lean mass. These trait differences are maintained in second-generation captive-born mice raised in a common environment. In addition, island–mainland hybrids reveal a maternal genetic effect on body weight. Using behavioural testing in the laboratory, we also find that wild-caught island mice are less aggressive than mainland mice; however, laboratory-raised mice born to these founders do not differ in aggression. Together, our results reveal that these mice have different responses to the environmental conditions on islands—a heritable change in a morphological trait and a plastic response in a behavioural trait.

Elastoplastic Analysis of Layered Metal Matrix Composite Cylinders—Part I: Theory

1996 ◽  
Vol 118 (1) ◽  
pp. 13-20 ◽  
Author(s):  
R. S. Salzar ◽  
M.-J. Pindera ◽  
F. W. Barton
Keyword(s):  
Metal Matrix Composite ◽  
Matrix Composite ◽  
Stiffness Matrix ◽  
Metal Matrix ◽  
Plastic Response ◽  
Solution Strategy ◽  
Composite Tubes ◽  
Elastic Plastic ◽  
Stiffness Matrices ◽  
Local Stiffness

An exact elastic-plastic analytical solution for an arbitrarily laminated metal matrix composite tube subjected to axisymmetric thermo-mechanical and torsional loading is presented. First, exact solutions for transversely isotropic and monoclinic (off-axis) elastoplastic cylindrical shells are developed which are then reformulated in terms of the interfacial displacements as the fundamental unknowns by constructing a local stiffness matrix for the shell. Assembly of the local stiffness matrices into a global stiffness matrix in a particular manner ensures satisfaction of interfacial traction and displacement continuity conditions, as well as the external boundary conditions. Due to the lack of a general macroscopic constitutive theory for the elastic-plastic response of unidirectional metal matrix composites, the micromechanics method of cells model is employed to calculate the effective elastic-plastic properties of the individual layers used in determining the elements of the local and thus global stiffness matrices. The resulting system of equations is then solved using Mendelson’s iterative method of successive elastic solutions developed for elastoplastic boundary-value problems. Part I of the paper outlines the aforementioned solution strategy. In Part II (Salzar et al., 1996) this solution strategy is first validated by comparison with available closed-form solutions as well as with results obtained using the finite-element approach. Subsequently, examples are presented that illustrate the utility of the developed solution methodology in predicting the elastic-plastic response of arbitrarily laminated metal matrix composite tubes. In particular, optimization of the response of composite tubes under internal pressure is considered through the use of functionally graded architectures.

On the Elastic-Plastic Response of a Large-Tow Triaxially Braided Composite

2003 ◽  
Vol 16 (2) ◽  
pp. 183-191
Author(s):  
Edward Zywicz ◽  
Michael J. O’Brien ◽  
Thao Nguyen
Keyword(s):  
Plastic Response ◽  
Braided Composite ◽  
Elastic Plastic
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