Long - term stress relaxation experiments of cellular silicone material were carried . the relationship between stress retention and time was obtained , changes aroused from stress relaxation were analyzed by modern analysis technique 摘要对硅泡沫材料的长期应力松弛进行了实验研究，得出了硅泡沫材料应力保持率与松弛时间的关系，并用现代分析测试技术对硅泡沫材料由应力松弛引起的变化进行了分析。
The stress relaxation times of hay are analyzed at different initial densities , and which are compared with the experiment results of the stress relaxation regulation of hay compressed in high density 摘要分析了牧草在不同初始密度下的应力松弛时间，针对牧草在高密度压捆过程中应力松弛规律，提出了根据牧草第1应力松弛时间确定高密度压捆机压缩频率，为合理选择高密度压捆机的压缩频率提供了一种新方法。
Second , a finite element program with four nodes - rectangle element is coded . a one - dimensional problem is analyzed with this program , and in turn , the creep and stress relaxation behaviors of articular cartilage under confined compression are numerically simulated 其次，编制了四结点四边形单元有限元程序，分析了一维多孔柱体算例，并进而对关节软骨围限压缩的蠕变和应力松弛行为进行了数值模拟。
The following items and data analysis are measured on the second stage surgery : ( 1 ) the area of the expanded skin . ( 2 ) comparison with the rapid and the conventional expansion . ( 3 ) tension of skin in vivo 在二期手术时进行如下的实验检测和数据分析： ( 1 )测量扩张皮肤的面积( 2 )常规扩张和快速扩张( 3 )在体皮肤的张力( 4 )皮肤的即时回缩率( 5 )组织学检查( 6 )皮肤的胶原含量( 7 )皮肤的生物力学特性，包括强度、应力应变关系、应力松弛、蠕变。
Based on the zero eigenvalue solutions and non - zero eigenvalue solutions of the problem of viscoelastic cylinders , as particular example , kelvin model ' s creep and maxwell model ' s stress relaxation are studied for the simple extension . the numerical results show that the model is reasonable , which is in agreement with viscoelastic characteristics 在得到粘弹性柱体问题的零本征值和非零本征值解析解的基础上，作为特例讨论了粘弹性柱体单向拉伸问题的kelvin模型的蠕变现象以及maxwell模型的应力松弛现象。
Abstract : the change in strength , plasticity and relaxation rate of pc steel strand before and after stabilizing has been analyzed by means of fracture and stress relaxation tests . the effect of treatment parameters and tensile stress on the properties was obtained and optimum parameters of stabilizing treatment were also proposed 文摘:通过对预应力( pc )钢绞线稳定化处理及随后的破断、应力松弛试验，分析了处理前后强度、塑性、松弛率指标的变化趋势，得出了工艺温度、张应力对性能指标的影响规律，进而提出了稳定化处理的最佳工艺参数。
( 1 ) based on the experiments , this thesis discusses the stress loss of vertical prestress caused by deformation of anchorage , the resilience of the tendon and the joint compression ( l2 ) , the elastic compression of the concrete ( l4 ) and the relaxation of the tendon ( l5 ) . it is concluded that the anchorage deformation is dominated in vertical stress loss . measures are suggested to diminish the loss of the vertical prestress during the design and construction of the bridge ( 1 )本文在试验的基础上,研究了竖向预应力筋的锚具变形、钢筋回缩和接缝压缩损失l2 、混凝土的弹性压缩损失l4和力筋的应力松弛损失l5 ,其中,第一项是最主要的损失,论文据此对设计和施工中如何减小竖向预应力的损失提出了自己的看法和建议。
At present plenty of experimental study has been made on the materials and structural performance of asphalt concrete cores in the world , and the design methods and construction technique as well as equipments have been more mature . however , there is still lack of the research of its basic performance . in this thesis , in combination with the actual project , the experimental study has been employed with the field core specimen and the specimen made in laboratory , mainly include the static triaxial test , confinement pressure stabilization test and stress relaxation test 目前，国内外对沥青混凝土心墙的材料和结构性能已进行了一些试验研究，其设计方法、施工工艺和设备较为成熟，但其基本性能研究方面显得较为薄弱，本文结合实际工程对沥青混凝土心墙的芯样和试验室成型的试件进行了试验研究，主要包括静三轴试验、围压稳定试验以及应力松弛试验研究，得到以下基本结论： 1
The relaxation resistance of the nitinb alloy affects the strength of the nitinb pipe coupling at high temperature , so that the relaxation experiment at various temperatures and various initial stresses was preformed to investigate the relaxation resistance of the nitinb alloy . the results show that nitinb alloy has good relaxation resistance in the temperature range 300 ~ 400c and the initial stress range 260 ~ 360 mpa , therefore the nitinb pipe coupling can work safely under the condition of temperature above 300c and initial stress no more than 360mpa Nitinb合金的抗松弛性能必将影响nitinb管接头的高温强度，于是首先对nitinb合金在不同温度不同初始应力下的抗松弛性能进行了研究，结果表明：温度在300 400 ，初始应力在260 360mpa时， nitinb合金抗应力松弛性能良好，用其制备的管接头能在温度不超过300 、应力不超过360mpa的条件下安全地工作。
The result shows that system anchoring bolt not only reduces the internal force of primary support and secondary support , hence improves safety of the supporting structure ; but also effectively restricts relaxation of surrounding rock , reinforces the surrounding rock , improves safety of the construction 研究结果表明，系统锚杆不仅可以大大降低一次支护和二次支护结构的内力，提高结构的安全度，而且可以有效抑止隧道周边围岩的应力松弛，改善周边围岩的受力特性，提高施工的安全性。
