变形行为

• The uniaxial fatigue life and deformation performance of a356 aluminum alloy under cross - stress - loading is studied in this paper , which is compared with the single - stress - loading fatigue
  摘要对处于交变应力下a356铝合金的单轴疲劳寿命以及变形行为进行了研究，并与单一应力加载下的加载情况进行了对比。
• And then , at the same condition of thickness , analyzing the deforming and reversing process of the diaphragm under three different kinds curves of time - pressure , a best time - pressure curve was gotten
  随后,在相同厚度分布的情况下,又分析比较了3种不同加载曲线对膜片变形行为的影响,得到了最佳的压力-时间曲线。
• The results of finite element modeling are in good accord with the experimental data obtained from the nanoindentation and nanoscratching tests . it proved that fem is an effective method to analyze the deformation behavior of ti - dlc films
  对ti - dlc膜的纳米压痕和划痕实验的数值模拟结果表明,有限元数值模拟是研究材料变形行为的一种有效手段。
• In order to accurately describe the strain - controlled cyclic deformation of material at high temperatures , an experimental research was carried out on the cyclic deformation of 304 stainless steel subjected to uni - axial and non - proportionally multi - axial cyclic straining at 350 and 700
  摘要为了对材料的高温应变循环变形行为进行精确的本构描述，在350和700下，对304不锈钢在不同加载路径下的单轴和非比例多轴应变循环变形行为进行了实验研究。
• The research indicate that the structured soft clay has below several characteristic , the viscous strain is produced during the stage of primary consolidation and of second consolidation , and in the prophase , the relation of stress - strain - strain rate is unique , so the form of constitutive model , such as , f ( v ' , e ) = 0 , f ( ' v , e , t ) = 0 , ca n ' t describe strain behavior of soil skeleton rationally ; the time - dependent properties involve three aspects , in addition the time - dependent strain , apparent preconsolidation pressures that depend on strain rate , and the effect of creep compression on apparent preconsolidation pressures ; because of holding structural strength , the mechanics characteristic is determined by the magnitude of stress , and the compression curve is composed of several sections . by combining structural yield stress and it ' s characteristics with the improved time line model , a new one - dimensional elastic visco - plastic consolidation model is established
  研究结果表明，结构性土的固结过程具有以下特性：主固结和次固结阶段都包含有因土骨架的粘滞性移动而产生的变形，而且在正常固结阶段，存在应力?应变?应变速率的唯一性， f ( _ v ， e ) = 0 、 f ( _ v ， e ， t ) = 0形式的本构关系不足以描述土骨架的变形行为；固结压缩过程中的时间效应包括三个方面的内容，除了应力应变关系与时间相关外，还包括粘滞性变形引起表观前期固结压力增加和屈服应力的应变速率效应；软土的结构性使其力学特性与应力水平相关，压缩曲线具有分段性。
• Thermodynamic couple numerical simulation of ring compression of pure aluminum and tube extrusion of superalloy gh4169 is done by adopting the constant friction model and the present friction model in the paper . numerical results are compared with experimental investigations to validate the correction and nicety of the present friction model of bulk metal forming processes . the accuracy of the finite element simulation of bulk forming processes can be improved by adopting the present friction model
  采用二次开发msc . superform软件,对纯铝圆环镦粗和高温合金gh4169管材挤压过程进行了热力耦合数值模拟,比较了采用本文提出的多因素摩擦模型和常摩擦模型对圆环镦粗和管材挤压过程变形行为的影响,通过与实验结果的比较,验证了本文的摩擦模型及其参数值的正确性,也说明了多因素摩擦模型提高了有限元模拟的精度。
• Abstract : development of researches on the deformation behavior and mechanism of discontinuous reinforced metal matrix composite was presented , including elastic deformation , micro - plastic deformation , macro - plastic deformation . in fluence factors on the deformation behaviors of the composites were also discussed , and further studies in the field is propected
  文摘:详细介绍了非连续增强金属基复合材料的弹性变形、微塑性变形、宏观塑性变形行为的研究现状，论述了复合材料变形行为的影响因素，并指出了进一步研究存在的主要问题。
• In this dissertation , the effect of texture , heat - treatment , and hydrogen on the lcf behavior of zircaloy - 4 and the cyclic deformation behavior for zircaloy - 4 , n18 alloy and n36 alloy have been investigated systematically using fully - reversed tension - compression loading under strain control ( r = min / max = - 1 ) , while the evolvement of the friction and back stresses versus the number of repeated working cycles and the plastic strain amplitude has been studied , and the thorough discussion combined with the analysis result of fatigue sub - structure , friction and back stresses , and fatigue fracture has been given to the mechanism underlying the lcf behavior of alloys
  本文采用对称拉压循环变形方法( r _ = _ ( min ) _ ( max ) = - 1 ) ，系统研究了织构、热处理状态、氢对zr - 4合金低周疲劳性能的影响， zr - 4合金、 n18合金和n36合金的循环变形行为，并研究了摩擦应力、背应力随循环周次、塑性应变幅的变化规律。结合疲劳亚结构和疲劳断口的分析结果，深入探讨了影响合金低周疲劳行为的作用机制。
• Development of researches on the deformation behavior and mechanism of discontinuous reinforced metal matrix composite was presented , including elastic deformation , micro - plastic deformation , macro - plastic deformation . in fluence factors on the deformation behaviors of the composites were also discussed , and further studies in the field is propected
  详细介绍了非连续增强金属基复合材料的弹性变形、微塑性变形、宏观塑性变形行为的研究现状，论述了复合材料变形行为的影响因素，并指出了进一步研究存在的主要问题。