Theoretical prediction of the mechanical behavior of two‐solid‐phase materials

2021 ◽  
Author(s):  
Leandro Bolzoni ◽  
F. Yang
Keyword(s):  
Theoretical Prediction ◽  
Mechanical Behavior ◽  
Solid Phase

Solid Phase Sheet Forming of Thermoplastics—Part I: Mechanical Behavior of Thermoplastics to Yield

1986 ◽  
Vol 108 (2) ◽  
pp. 107-112 ◽  
Author(s):  
V. K. Stokes ◽  
H. F. Nied
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Solid Phase ◽  
Hold Time ◽  
Sheet Forming ◽  
Temperature Deformation ◽  
Polybutylene Terephthalate ◽  
Forming Process ◽  
Time Periods ◽  
Insight Into

The detailed mechanical behavior to yield of three thermoplastics—polycarbonate, polybutylene terephthalate, and polyetherimide—subjected to simulated forming histories, is examined in order to gain an insight into the sheet forming process for thermoplastics. The phenomenology of yield is shown to be quite different for semicrystalline polybutylene terephthalate when compared with amorphous polycarbonate and polyetherimide. The dependence of the mechanical properties of thermoplastics on temperature, deformation rate and hold-time periods are shown to be important for understanding and controlling the solid phase sheet forming process.

Stress-Free Strains in Martensitic Microstructures

2013 ◽  
Vol 738-739 ◽  
pp. 10-14
Author(s):  
Michaël Peigney
Keyword(s):  
Phase Transformation ◽  
Theoretical Prediction ◽  
Shape Memory ◽  
Closed Form ◽  
Solid Phase ◽  
Closed Form Solutions ◽  
Special Cases ◽  
Crystallographic Structures ◽  
Solid Phase Transformation ◽  
Free Strains

The peculiar properties of shape-memory alloys are the result of a solid/solid phase transformation between different crystallographic structures (austenite and martensite). This paper is concerned with the theoretical prediction of the set of strains that minimize the effective (or macroscopic) energy. Those strains, classically refered to as recoverable strains, play a central role in shape memory effect displayed by alloys such as NiTi or CuAlNi. They correspond to macroscopic strains that can be achieved in stress-free states. Adopting the framework of nonlinear elasticity, the theoretical prediction of stress-free strains amounts to find the austenite/martensite microstructures which minimize the global energy. Closed-form solutions to that problem have been obtained only in few special cases. This paper aims at complementing existing results on that problem, essentially by deriving bounds on the set of stress-free strains.

scholarly journals A damage model of mechanical behavior of porous materials: Application to sandstone

2017 ◽  
Vol 27 (9) ◽  
pp. 1325-1351 ◽  
Author(s):  
MY Li ◽  
YJ Cao ◽  
WQ Shen ◽  
JF Shao
Keyword(s):  
Porous Medium ◽  
Mechanical Behavior ◽  
Porous Materials ◽  
Solid Phase ◽  
Damage Model ◽  
Multiscale Model ◽  
Elementary Volume ◽  
Elastoplastic Model ◽  
Porous Sandstone ◽  
Damage Process

In this work, a multiscale model based on the Fast Fourier Transform (FFT) technique is applied to describe the mechanical behavior of porous materials. The effects of the microstructures (such as pore shape, number, size, distribution and orientation) on the overall strength of the porous medium and its microstress distribution are fully studied. The elastoplastic model is further extended by including a damage process. The influences of microstructure on the damage evolution of the porous medium are discussed and illustrated numerically. Then the proposed multiscale damage model is applied to study the macroscopic behavior of porous sandstone. According to the microstructure of the studied material, a representative elementary volume with randomly distributed spherical pores is considered. The solid phase of the sandstone is assumed to obey the Drucker–Prager criterion. Taking advantage of the FFT-based method, the evolution of generated damage is clearly illustrated during the loading process at the microscopic level. Comparisons between numerical results and experimental data show the efficiency of the proposed numerical model.

Preparation of aluminum titanate flexible ceramic by solid-phase sintering and its mechanical behavior

2019 ◽  
Vol 777 ◽  
pp. 119-126 ◽  
Author(s):  
Weiwei Chen ◽  
Anze Shui ◽  
Cong Wang ◽  
Jianqiao Li ◽  
Juan Ma ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Solid Phase ◽  
Aluminum Titanate

Constitutive model for rate-independent behavior of saturated frozen soils

2016 ◽  
Vol 53 (10) ◽  
pp. 1646-1657 ◽  
Author(s):  
S.A. Ghoreishian Amiri ◽  
G. Grimstad ◽  
M. Kadivar ◽  
S. Nordal
Keyword(s):  
Constitutive Model ◽  
Mechanical Behavior ◽  
Solid Phase ◽  
Fluid Pressure ◽  
Frozen Soil ◽  
Reverse Direction ◽  
State Variables ◽  
Soil Behavior ◽  
Frozen Soils ◽  
Strain Behavior

The mechanical behavior of frozen soils is strongly affected by the amount of ice. The amount of ice depends on the temperature and the applied mechanical stresses. The influence of ice content and temperature on the mechanical behavior and the coupling effects on the reverse direction can be mentioned as the main difference between frozen and unfrozen soils. In the light of this difference, an elastoplastic constitutive model for describing the stress–strain behavior of saturated frozen soils is proposed. By dividing the total stress into fluid pressure and solid phase stress, in addition to consideration of the cryogenic suction, the model is formulated within the framework of two-stress state variables. The proposed model is able to represent many of the fundamental features of the behavior of frozen soils, such as ice segregation phenomenon and strength weakening due to pressure melting. In the unfrozen state the model becomes a conventional critical state model. Typical predictions of the model for simulating the characteristic trends of the frozen soil behavior is described qualitatively. Model predictions are also compared with the available test results and reasonable agreement is achieved.

Multi-Scale Mechanical Behavior of the Li3PS4 Solid-Phase Electrolyte

2016 ◽  
Vol 8 (43) ◽  
pp. 29573-29579 ◽  
Author(s):  
Lauryn L. Baranowski ◽  
Chelsea M. Heveran ◽  
Virginia L. Ferguson ◽  
Conrad R. Stoldt
Keyword(s):  
Mechanical Behavior ◽  
Solid Phase ◽  
Multi Scale

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

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