Papers by Keyword: Thermo-Mechanical

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Authors: Justin O. Karl, Andrew T. Copeland, Amy K. Besio
Abstract: The behavior of parts subjected to simultaneous thermal and mechanical fatigue loads is an area of research that carries great significance in the power generation, petrochemical, and aerospace industries. Machinery with expensive components undergo varying applications of force while exposed to variable temperature working fluids. An example case is found in steam turbines, which subject stainless steel blades to cyclic loads from rotation as well as the passing of heated gases. Accurate service life prediction is especially challenging due to the thermo-mechanical loading being present on the complex geometric profile of the blades. This research puts forth a method for determining crack initiation lifetimes in variably-notched type 304 austenitic stainless steel specimens subjected to differing fatigue and thermo-mechanical fatigue conditions. A base analytical model and genetic algorithm were used to develop phenomenology-informed predictions that fall within a factor of two of the actual crack initiation times.
Authors: Ze Wu Wang, Qian Zhang, Liang Zhi Xia, Da Peng Hu
Abstract: At present, limited work was reported on the exact solution of axial stress for a multilayered pressure vessel subjected to mechanical and thermal loads. However, the axial stress plays an important role to the structural strength due to the influence of thermal load. Based on the theory of thermo-elasticity and finite element (FE) technology, therefore, the exact solution and numerical solution were constructed for a multilayered urea synthesis tower made of different kinds of materials subjected to an internal pressure and a thermal load. Results show good agreement between the theoretical solution and numerical solution, and thus it demonstrates the reliability of the derivation process and developed calculation formula, which would be helpful for more precise calculation and scientific design of the multilayered pressure vessel.
Authors: Xin Gong, Jing Chen, Jong Ho Lee
Abstract: As pitch of TSV shrinks down, mechanical characteristics of TSVs become more complicated and the heat of chip becomes a critical issue. The objective of this paper is to study thermal mechanical characteristics of ultra-fine pitch TSV. The thermal-mechanical characterization of an ultra-fine pitch chip is simulated with FEA.
Authors: Anoop Kumar, Balasunder, T. Raghu, S. Rajesham
Abstract: High specific strength metals with high formability are paramount requirement for maximizing productivity of structural components, aircraft panels & engine components in Automotive & aerospace industry. The material must be suitably processed for better strength & more formability. The formability depends upon several factors one of which is grain size. Finer the grain size better is the formability. In the present study the influence of temperature of thermo-mechanical treatment (TMT) on the microstructure of titanium ally Titan 31 in order to identify suitable TMT to refine the grain size has been investigated.The material was subjected to hot rolling at different temperatures in the range 800°C -900°C. Subsequently the material was subjected to annealing as well as normalizing heat treatments. Grain size and hardness measurements were carried out to identify suitable TMT. The study revealed that rolling at 800°C followed by annealing at the same temperature resulted finer grain size and low hardness that are conducive for better formability.
Authors: Mahmoud Khaled, Mohamad Ramadan, Ahmed Elmarakbi, Lionel Fourment
Abstract: The aim of this paper is to study the simulation of cogging process using a thermo-mechanical partitioned algorithm. The thermal and mechanical problems are solved separately. The mechanical problem is based on the balance equation whereas the thermal problem is based on the heat equation. The two physics are coupled trough the mechanical parameters that depends on the thermal problem and vice versa. The results obtained using the software Forge3 show that the mechanical deformation is high inside the zone of deformation and negligible outside whereas the temperature is high overall the mesh with a gradient at the zone of contact between the dies and the work piece.
Authors: Jin Wu, Hai Quan Guo, Da Sen Bi
Abstract: Thermoforming is a typical process to manufacture ultra-high strength steel sheet in auto industry. 22 MnB5 type is the widely used sheet. This paper uses thermal coupler software Pam-stamp 2011 to simulate the thermoforming of 22 MnB5 steel sheets. Get the temperature field distribution of thermoforming parts and martensite content. In addition, it discusses the thermal forming experiment process. Test the contents of thermoforming parts such as tensile strength, vickers hardness and so on. The experimental results show that in the components of this experiment, the hardness of the side wall is higher than other places. In the analysis of the microstructure, we can see that the thermal forming components are of martensite structure. Seen from the results of the simulation, they are consistent with the data from the experiment.
Authors: Stephen Akinlabi, Esther Titilayo Akinlabi
Abstract: Laser Beam Forming is a flexible manufacturing process with great promise for sheet and metal forming, hence, considered as a novel manufacturing method for forming and shaping of metallic components. Being a thermo-mechanical forming process that enables parts or components to be formed with external heat of a laser beam, it is important to monitor and measure the temperature during the laser forming process in order to ensure the integrity of the processed components. This study reports on the temperature monitoring and measurement during laser beam forming process of steel sheets. The experimental design followed the L-27 Taguchi Orthogonal Array. The temperature of nine sets of samples laser beamed formed at different process parameters were monitored using the thermocouple data logger. The temperature for all the components formed at the nine parameter windows were analysed during the process. Hence, it was observed that the measured temperature increases with the increasing line energy during the laser beam forming process.
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