Strain and temperature dependences in anisotropic constitutive equations for metal plasticity

PC机控制的复合应力试验机是1991年研制成功的。为了研究金属在高温下的各向异性弹粘塑性行为，设计并研制了与该试验机配套的电炉和温度控制器。还设计和研制了带水冷器的轴向和扭转联合加载的杆。开发这些设备的费用由这笔赠款支持。试件外径、量规长度和扭转变形的变化传递到炉外。由于测量外径的仪器是固定在炉壁上的，所以顶锤在试件表面滑动。通过数据处理，消除了滑移引起的噪声。直径的变化是用薄板上的应变片来检测的。轴向和扭转联合变形的测量仪器必须安装在试件上，不受试件变形的约束。…对于薄壁试件来说，更多的但通常的突起是不合适的。为解决这一问题，采用光滑试件，设计了连杆加重物装置。在所设计的测量装置中，轴向变形和扭转变形被分离，并用差动变压器进行检测。这笔赠款支持购买四套变压器以及连接电缆和防护罩的费用。用于这些变压器的多位移计是另一项支出。针对该项目，开发了一套用于双线性塑性应变路径的室温实验及后续屈服面确定的软件。此外，在1992年11月举行的JSME关西分会上，还提出了用桁架格子模型表达应变历史相关的弹塑性本构关系的研究。1993年对超塑性材料变形行为的应变率和温度依赖性进行了研究。结果将在不久的将来公布。较少

Personal computer controlled combined stress testing machine was developed in 1991. For investigation into anisotropic elastic-viscoplastic behavior of metals at high temperature, an electric furnace attachable to this testing machine and temperature controller were designed and developed. Rods for combined axial and torsional loading with water-cooler were also designed and developed. The expense for developments of these apparata was supported by this grant. The change in outer diameter and gauge length and torsional deformation of specimen are transmitted to outside of the furnace. Since the apparatus for measuring outer diameter is fixed to the wall of furnace, anvils slip on the surface of the specimen. The noise caused by slip is smoothed out by data processing. The change in diameter is detected by strain gauges on thin plates. The measuring apparatus for combined axial and torsional deformation must be attached to specimen without constraint to the deformation of the specimen. … More But usual protrusion is not adequate for thin-walled specimen. To cope with this problem, smooth specimen was adopted and a device with link and weight was designed. In the designed measuring apparatus, the axial and torsional deformation is separated and detected by differential transformer. The expense for four sets of transformer and connecting cable and braket was supported by this grant. The multi-displacement meter for these transformers was an another outlay. But the designed apparatus could not be developed because of shortage of expense.Relating to this project, a software for room temperature experiments of bilinear plastic strain path and determination of subsequent yield surface was developed. Furthermore, a study on expression of strain history dependent elastic-plastic constitutive relation with a truss lattice model was presented at JSME Kansai branch meeting held on Nov.1992. Strain-rate and temperature dependency of the deformation behavior of a superplastic material was investigated in 1993. Results will be presented in near future. Less