scholarly journals Research on the simulation technology of the combined effects of transient thermal shock and a triaxial 6-DOF

2020 ◽  
Vol 1633 ◽  
pp. 012068
Author(s):  
Zemin Yao ◽  
Xiaokai Huang ◽  
Shouqing Huang ◽  
Shouwen Liu
Keyword(s):  
Thermal Shock ◽  
Combined Effects ◽  
Simulation Technology ◽  
Transient Thermal

Transient thermal shock behavior simulation of porous silicon nitride ceramics

2016 ◽  
Vol 42 (2) ◽  
pp. 3130-3137 ◽  
Author(s):  
Meng Chen ◽  
Hongjie Wang ◽  
Haiyun Jin ◽  
Xide Pan ◽  
Zhihao Jin
Keyword(s):  
Silicon Nitride ◽  
Porous Silicon ◽  
Thermal Shock ◽  
Behavior Simulation ◽  
Nitride Ceramics ◽  
Thermal Shock Behavior ◽  
Transient Thermal

scholarly journals Mechanical Performance Evaluation of the Al-Mg-Si-(Cu) Aluminum Alloys after Transient Thermal Shock through an Novel Equivalent Structure Design and Finite Element Modeling

Metals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 537
Author(s):  
Congchang Xu ◽  
Ke Liu ◽  
Hong He ◽  
Hanlin Xiang ◽  
Xinxin Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Thermal Shock ◽  
Constitutive Relation ◽  
Mechanical Performance ◽  
Lap Joints ◽  
Structure Design ◽  
Equivalent Structure ◽  
Material Constitutive Relation ◽  
Transient Thermal

In this paper, the microstructure evolution and mechanical performance of the Al-Mg-Si-(Cu) aluminum alloy after transient thermal shock were investigated through experimental tests and finite element simulations. A novel equivalent structure was designed as a typical case in which one side of the plate was welded therefore the other side was thermally shocked with different temperature distribution and duration. The temperature gradient which influences most importantly the mechanical properties was simulated and experimentally verified. Through cutting layers and tensile testing, the mechanical response and material constitutive relation were obtained for each layer. Gurson-Tvergaard-Needlemen (GTN) damage parameters of these samples under large strains were then obtained by the Swift law inverse analysis approach. By sorting the whole welded joint into multi-material composed structure and introducing the obtained material constitutive relation and damage parameters, tensile properties were precisely predicted for typical types of weld joint such as butt, corner, and lap joints. The results show that precipitate coarsening, phase transformation from β″ phase to Q′ phase, and dissolving in the temperature range of 243.3–466.3 °C during the thermal shock induced a serious deterioration of the mechanical properties. The highest reduction of the ultimate tensile strength (UTS) and yield strength (YS) would be 38.6% and 57.4% respectively. By comparing the simulated and experimentally obtained force-displacement curves, the error for the above prediction method was evaluated to be less than 8.1%, indicating the proposed method being effective and reliable.

Response of hela cells to transient thermal shock

2011 ◽  
Author(s):  
K. Mitsutake ◽  
S. Moriyama ◽  
K. Abe ◽  
S. Katsuki ◽  
H. Akiyama ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Hela Cells ◽  
Transient Thermal

Precise Integration Symplectic Analytical Singular Element for Cracks Analysis Under Transient Thermal Conduction

2020 ◽  
Vol 12 (01) ◽  
pp. 2050005
Author(s):  
Xiaofei Hu ◽  
Xing Ding ◽  
Tinh Quoc Bui ◽  
Weian Yao
Keyword(s):  
Numerical Modeling ◽  
Thermal Shock ◽  
Thermal Conduction ◽  
Unified Framework ◽  
Singular Element ◽  
Initial Value ◽  
Precise Integration ◽  
Error Accumulation ◽  
Transient Thermal ◽  
Numerical Approaches

Numerical modeling of mechanical behavior of cracks under transient thermal conduction involves solving an initial value problem (IVP) and two boundary value problems (BVPs). Both of the BVPs have a singularity issue. Drawbacks such as numerical error accumulation and high computational expense of existing numerical approaches should be overcome. This contribution intends to build a unified framework with highly efficiency and accuracy for the numerical modeling of cracks under thermal shock. The precise integration method (PIM) and the symplectic analytical singular element (SASE) have been demonstrated to be favorable alternatives for each problem, i.e., the PIM for solving the IVP and SASE for the BVP. However, it is found that these two methods cannot be combined directly. In order to incorporate the SASEs into the PIM, the existing SASEs are reformulated for the thermal shock cracks analysis. Details of the mathematical derivations are provided. The validity of the proposed method is demonstrated through numerical examples.

Generalized solutions of transient thermal shock problem with bounded boundaries

Meccanica ◽  
2016 ◽  
Vol 52 (8) ◽  
pp. 1935-1945 ◽  
Author(s):  
Y. Z. Wang ◽  
D. Liu ◽  
Q. Wang ◽  
J. Z. Zhou
Keyword(s):  
Thermal Shock ◽  
Generalized Solutions ◽  
Transient Thermal ◽  
Thermal Shock Problem

Thermal Shock Behavior of a Functionally Graded Material Plate with a Crack

2013 ◽  
Vol 275-277 ◽  
pp. 152-155 ◽  
Author(s):  
Yan Yan Zhang ◽  
Li Cheng Guo ◽  
Feng Nan Guo ◽  
Hong Jun Yu ◽  
Kai Huang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Functionally Graded Material ◽  
Functionally Graded ◽  
Temperature Fields ◽  
Transient Temperature ◽  
The Finite Element Method ◽  
Graded Material ◽  
Thermal Shock Behavior ◽  
Transient Thermal ◽  
Thermal Shock Problem

A thermal shock problem of a functionally graded material plane (FGMP) containing a crack is considered. All the material properties of the FGMP are assumed to be dependent on the coordinates.The transient temperature fields are solved by combining the finite difference method (FDM) and the finite element method (FEM). Then the transient thermal stress intensity factors (TSIFs) are obtained using the interaction energy integral method. The transient characteristics of the TSIFs are investigated.

scholarly journals Effects of Transient Thermal Shock on the Microstructure and Mechanical Properties of CoCrFeNiMn High-Entropy Alloy Coatings

2021 ◽  
Vol 8 ◽  
Author(s):  
Jing-Tong Liu ◽  
Si-Wei Liu ◽  
Hai-Lan Zheng ◽  
Wen-Jing Huang ◽  
Wei Zhao ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Extreme Environments ◽  
Atmospheric Plasma ◽  
High Fracture Toughness ◽  
High Entropy Alloy ◽  
Solid Solution Phase ◽  
Face Centered Cubic ◽  
High Fracture ◽  
High Entropy ◽  
Transient Thermal

CoCrFeNiMn high-entropy alloy (HEA) has great potential for engineering application due to its good ductility and high fracture toughness at low temperature. It can be deposited on components as coatings to take advantage of its excellent properties and reduce the cost. In this study, CoCrFeNiMn HEA coatings were deposited on 316L stainless steel substrates by atmospheric plasma spraying (APS) technique, and a series of transient thermal shock tests were performed. It was found that the coatings contained two main phases: a face-centered cubic (FCC) solid solution phase and a flocculent oxides phase. The elemental contents of Co, Cr, Fe, and Ni were close to equal atomic percentage in the coating, while Mn was reduced significantly. The oxygen was mainly distributed in the dark flocculent oxides phase. After transient thermal shock tests, these two phases remained stable, but some tiny cracks appeared on the surface. Meanwhile, the microhardness of the coating after transient thermal shock tests also showed stable, ∼ 420 HV. Weibull statistics were used to analyze the reliability of the microhardness, and the Weibull modulus m was distributed from 9 to 15. The CoCrFeNiMn HEA coating exhibited high phase stability and excellent properties under transient thermal shock, making it have service advantages in extreme environments, especially in the fields of the development of future nuclear and aerospace structural materials.

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