Calculation of Isothermal Flow Stress by the Combination of FEM and a Simple Compression Test.
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概要
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In forging of parts with complicated shapes or of high strength materials, it is important to predict the accurate load and the tool pressure, and thus it is essential to evaluate the exact flow stress of materials. In the practice, nominal flow stress calculated from a simple compression test, which is derived by diving the load by the cross-sectional area, is often used for approximate evaluation of forming load. This nominal flow stress contains the effects of the frictional force, the change in ternperature caused by plastic deformation, and the heat transfer between the tool and the material. These effects are especially significant in a high swain range. To obtain an accurate flow curve, the rigid-plastic FEM-analysis is carried out by using the approximate value of flow stress obtained from a simple compression test and the effects of friction and heat transfer are eliminated. Then, isothermal flow stress which corresponds to the strain, strain rate and temperature at each point of material is derived from this result. It is concluded that the ratio of nominal stress to isothermal flow stress ranges from 0.75 to 2.0.
- 一般社団法人 日本機械学会の論文
一般社団法人 日本機械学会 | 論文
- PREFACE
- Hybrid Vibration Suppression of Flexible Structures Using Piezoelectric Elements and Analog Circuits
- Application of Momentum Exchange Impact Dampers to Forging Machine
- アルミニウム繊維層を設置した流路の熱伝達と圧力損失特性
- 地震荷重下における配管のき裂進展評価手法の提案