A constitutive model and data for materials subjected to large strains, high strain rates, and high temperatures
01 Jan 1983-pp 541-547
About: The article was published on 1983-01-01 and is currently open access. It has received 3793 citations till now. The article focuses on the topics: Constitutive equation.
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TL;DR: In this paper, a cumulative-damage fracture model is introduced which expresses the strain to fracture as a function of the strain rate, temperature and pressure, and the model is evaluated by comparing computed results with cylinder impact tests and biaxial (torsion-tension) tests.
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TL;DR: In this article, the state of the art in the thermal, mechanical, microstructural, and technological fields of hot stamping is reviewed, and the investigations of all process sequences, from heating of the blank to hot stamps and subsequent further further processes are described.
1,397 citations
TL;DR: In this article, the authors address the problems of stability and the lack of generalized boundary conditions in the Smoothed Particle Hydrodynamics (SPH) computing technique and propose solutions.
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TL;DR: In this paper, a critical review on some experimental results and constitutive descriptions for metals and alloys in hot working, which were reported in international publications in recent years, is presented.
1,071 citations
TL;DR: In this paper, the authors provide an overview of machining induced surface integrity in titanium and nickel alloys and conclude that further modeling studies are needed to create predictive physics-based models that is in good agreement with reliable experiments.
Abstract: Titanium and nickel alloys represent a significant metal portion of the aircraft structural and engine components. When these critical structural components in aerospace industry are manufactured with the objective to reach high reliability levels, surface integrity is one of the most relevant parameters used for evaluating the quality of finish machined surfaces. The residual stresses and surface alteration (white etch layer and depth of work hardening) induced by machining of titanium alloys and nickel-based alloys are very critical due to safety and sustainability concerns. This review paper provides an overview of machining induced surface integrity in titanium and nickel alloys. There are many different types of surface integrity problems reported in literature, and among these, residual stresses, white layer and work hardening layers, as well as microstructural alterations can be studied in order to improve surface qualities of end products. Many parameters affect the surface quality of workpieces, and cutting speed, feed rate, depth of cut, tool geometry and preparation, tool wear, and workpiece properties are among the most important ones worth to investigate. Experimental and empirical studies as well as analytical and Finite Element modeling based approaches are offered in order to better understand machining induced surface integrity. In the current state-of-the-art however, a comprehensive and systematic modeling approach based on the process physics and applicable to the industrial processes is still missing. It is concluded that further modeling studies are needed to create predictive physics-based models that is in good agreement with reliable experiments, while explaining the effects of many parameters, for machining of titanium alloys and nickel-based alloys.
986 citations