共搜索到210条信息，每页显示10条信息，共21页。用时：0小时0分0秒461毫秒
as the dominant charge pathways of highly pressurized gas in the study area. Our results demonstrate that protracted growth of a pervasive fracture system is not only the consequence of various formation... of highly pressurized gas (Figure 13). The frequently-appearing gas shows in Ma57 and Ma58 of J-1 well by the comprehensive logging interpretation and logging display have been proven effective......
用可变长度热源模拟奥氏体不锈钢多层焊对接接头的焊接残余应力邓德安1,清岛祥一2(1.重庆市重庆大学材料科学与工程学院2.计算力学研究中心技术开发部)摘 要:采用可变长度热源模型对奥氏体不锈钢平板多层焊对接接头的残余应力进行了数值模拟,同时也用实验方法测量了平板对接接头上下表面的残余应力,通过比较由热弹塑性有限元计算得到的残余应力与由电阻应变片法测量得到的实验结果得知,采用该模型对多层焊对接接头残余应力的数值模拟,不仅可以大大缩短计算时间,也可以得到较高的计算精度.关键词:焊接残余应力； 数值模拟；......
热老化对Z3CN20-09M不锈钢微区力学性能和冲击断裂行为的影响李时磊1,王西涛1,王艳丽1,李树肖1(1.北京市北京科技大学新金属材料国家重点实验室)摘 要:通过纳米力学探针对铁素体相在热老化过程中的力学性能变化进行了研究.采用仪器化冲击试验机研究了材料的冲击行为,使用SEM观察冲击断口形貌.结果表明:长期热老化导致铁素体相的塑性变形能力不断下降,材料的冲击韧性也显著下降.热老化过程中冲击功的损失主要是由于裂纹扩展能量的降低引起,在400℃热老化1×104h后裂纹稳定扩展能几乎降为0.热老化材料的冲击断裂过......
Creep behavior of plasma sprayed NiCr and NiCrAl coating-based systemsShan-Tung TUKey Laboratory of Safety Science of Pressurized System,Ministry of Education,East China University of Science and Technology摘 要:The creep behavior of the plasma sprayed NiCr and NiCrAl coating/Nickel alloy 690 substrate systems at 1033 K was investigated.Results showed......
Creep crack growth in a Cr-Mo-V type steel: experimental observation and predictionShan-Tung TUKey Laboratory of Safety Science of Pressurized System, Ministry of Education, School of Mechanical and Power Engineering, East China University of Science and Technology摘 要:In this study, the creep crack growth (CCG) properties and fracture mechanism of a Cr......
of the supporting pressure. For example, the face stability of shallow circular tunnels driven by the pressurized shield is intimately linked to the collapse and blow-out face pressure [4]. Therefore... in Geomechanics, 2013, 37(18): 3194-3212. [4] YANG Xiao-li, YAO Cong, ZHANG Jia-hua. Safe retaining pressures for pressurized tunnel face using nonlinear failure criterion and reliability theory [J]. Journal......
not produce heat [2]. Most current air conveyors use orifice to spout pressurized air beneath the workpieces, with the same principle as orifice bearings. research on pressure distribution of the air conveyor... difficult to adjust all the tracks on a plane. In an effort to overcome the problem, a modified noncontact air conveyor is proposed as shown in Fig. 2. Pressurized air is supplied through a number of porous......
is pressurized and forms the blank around the punch [2,3]. The created frictional force between the blank and the punch allows to apply higher pressures, thus stress concentration is reduced... different punches. Hydrodynamic deep drawing assisted by radial pressure (HDDRP) is a special application of HDD, in which the pressurized forming liquid is applied also to the outer edge of the blank......
to the direction of the crack in a body and σu is the nominal stress required to produce a plastic hinge on the net section. For the pressurized cylinders, σf is the hoop stress at the failure pressure...: 198-204. [4] CHRISTOPHER T, SANKARANARAYANASAMY K, NAGESWARA RAO B. Fracture behavior of Maraging steel tensile specimens and pressurized cylindrical vessels [J]. Fatigue, Fracture of Engineering......
(1): 56-62. [19] MOLLON G, DIAS D, SOUBRA A H. Continuous velocity fields for collapse and blowout of a pressurized tunnel face in purely cohesive soil [J]. International Journal for Numerical and Analytical Methods in Geomechanics, 2013, 37(13): 2061-2083. [20] IBRAHIM E, SOUBRA A H, MOLLON G, RAPHAEL W, DIAS D, REDA A. Three-dimensional face stability analysis of pressurized tunnels driven......
