Results 21 to 30 of about 1,072 (145)
Jianzhu Gangjiegou Jinzhan, 2019 整体节点由于存在大量焊缝,在往复荷载作用下,往往会引起疲劳问题。目前,对整体节点疲劳性能的研究仅限于某一特定工程的验证性试验,缺乏系统性的疲劳寿命评估方法的研究。详细介绍了热点应力法、有效缺口应力法和局部应变法的分析过程和适用范围,并结合一种简化焊接试件的疲劳试验,分别采用这几种方法对整体节点的疲劳寿命进行了分析。在此基础上,将分析结果与试验数据、相关规范进行对比,发现热点应力法和有效缺口应力法均能在一定程度上预测疲劳寿命的变化趋势,二者计算结果相似,但对实际工程偏危险 ...
郭琪, 邢颖, 韩庆华, 黄欣
doaj
Investigation of the internal failure mechanism of laser-additively manufactured nickel-based superalloy [PDF]
Nickel-based superalloys exhibit excellent high strength and thermal fatigue resistance at 650 ℃, making them widely used for manufacturing elevated-temperature components such as turbine blades for aero-engines.
Chuanwen SUN, Rui SUN, Wei LI
core +1 more source
Computer Simulating of Through or part-through Fatigue Crack Propagation [PDF]
, 1996 根据疲劳裂纹扩展的规律，对等幅和变幅谱载下CCT及PS（T）试件的疲劳裂纹扩展进行了计算机模拟。其结果经疲劳试验考评，误差在40%以内，能满足疲劳分析的要求。According to characters of Fatigue crack propagation,we imitated the tests of CCT and PS(T) by computer under constant amplitude and varied amplitude spectrum loading.The ...
宋建华, 成建国, 黄振仁
core
Corrosion-damage behavior of 38CrMoAlA steel under alternating hot-humid/salt-fog conditions and its effect on mechanical properties for aircraft–engine applications [PDF]
38CrMoAlA steel is widely used in critical components, such as blower drive shafts of aircraft engines, because of its remarkable mechanical properties and surface hardening potential.
Fubing LIU +5 more
core +1 more source
Shiyou jixie, 2014 针对现有连续管疲劳损伤检测评价方法存在的不足，提出了基于金属磁记忆方法的连续管疲劳损伤评价方法，建立了连续管疲劳损伤状况判别支持向量机（SVM）模型。选取CT80材质的连续管进行弯曲疲劳损伤磁记忆检测试验研究，利用判别模型对试验数据进行分析，结果表明，SVM模型能够较好地建立起连续管疲劳损伤状态与磁记忆信号之间的映射关系，并能清晰地反映连续管的疲劳损伤过程，为检测连续管疲劳失效提供了一种新的判别方法。
范磊, 樊建春, 李晓秋, 雷军
doaj
, 1995 对三种低碳钢的不同缺口的轴对称圆柱形试样在大应变循环下的低周疲劳行为进行了研究。以考察失效周次在１００次以内的疲劳断裂行为。结果表明随着被控循环应变幅度的增大，低碳钢的低周疲劳寿命降低，断裂模式则由疲劳解理逐渐向延性韧窝过渡。缺口处的三向应力程度以及起始循环加载的静态损伤都对最终的疲劳失效有重要的影响。建议采用一种广义的循环应变参量上来概括影响这种大应变低周疲劳的诸因素，从而可以采用修正的Ｃｏｆｆｉｎ ...
张以增 +4 more
core
Research progress on extraction, structural, functional properties and applications of Tuber polysaccharides [PDF]
Polysaccharides are the main active ingredients of edible fungi, which have been widely utilized in the food industry. As a member of the truffle family, Tuber are rich in polysaccharides.
LI Jian +3 more
core +1 more source
基于线性匹配方法的核电站弯管在循环载荷下的安定性分析 [PDF]
, 2019 Ratcheting effect experiments of 90° elbow pipes under internal pressure and in-plane bending were carried out for nuclear power plants herein, and then the limit load, shakedown load and ratcheting boundary of 90°elbow pipes were studied by numerical ...
Chen, Haofeng, Chen, Xiaohui, Chen, Xu
core +1 more source
Jixie chuandong, 1989 本文以齿轮为研究对象,用常用的辊子模拟方法,分别在40Cr钢调质（HB310）和40Cr钢中硬（HB410）两种试验辊子上用电刷镀铜工艺进行表面处理,然后与未镀辊子一起进行接触疲劳强度对比试验,共试验辊子40对,结果表明:选取适当的刷镀参数,电刷镀铜能较显著地提高齿轮等滚滑接触表面的疲劳寿命。文中同时分析了电刷镀铜提高接触疲劳强度的机理。
黄华梁, 张秀林
doaj
Jianzhu Gangjiegou Jinzhan, 2022 采用基于断裂力学的有限元法对焊接H形钢梁的疲劳裂纹扩展过程进行了数值模拟。给出了模型的基本假定：初始裂纹为半径1.016 mm的圆形、裂纹中心位于受拉翼缘与腹板之间焊缝焊根处、裂纹前缘由3~4段1/4椭圆弧线控制、在裂纹前缘端点处与内部点处分别采用不同的Paris公式系数、以疲劳裂纹深度穿透受拉翼缘壁厚或SIF超过断裂韧性为循环终止条件。采用二次多项式外推插值的方式对H形钢梁裂纹前缘端点处以及紧邻端点的个别结点处直接输出的应力强度因子（SIF）计算值进行了修正。通过试验验证 ...
肖顺, 童乐为
doaj