In the low cycle plastic fatigue period, the fatigue progress life Nfcan al - so be increased by 1 time.
在低周塑性疲劳阶段构件的疲劳开裂寿命仍可提高1倍左右。
In this paper the mechanism of plastic fatigue crack growth (PFCG) was analyzed and an appropriate criterion was proposed. Elastic-plastic (incremental) finite-element method was used to study PFCG.
本文分析了裂纹塑性疲劳扩展的力学机理，提出了裂纹塑性疲劳扩展的判据。
The cumulative plastic strain energy increases with the increase of the loading frequency and stress level, which is linear with fatigue life on semilog coordinate.
累积塑性应变能随着加载频率及应力水平的增加而增加，与疲劳寿命在半对数坐标下呈线性关系。
Then, constitutive equations are written for plastic, creep and fatigue damage phenomena.
从而建立了塑性、蠕变和疲劳损伤现象的本构方程。
Through analysis, the failure reason was confirmed as that the low cycle fatigue caused by plastic deformation occurred in the lead alloy, thus the fracture occurred.
分析其失效原因为铅合金在外力作用下，产生塑性变形引起的低周疲劳，造成断裂。
The point of intersection of elastic line and plastic line moves toward the low cycle life with the hardness of the spring steel raised after tempering from the strain fatigue curve.
在应变疲劳曲线上，弹性线和塑性线的交点随弹簧钢回火后硬度的升高而向低循环寿命移动；
The result shows: the local residual tensile stress and cyclic compressive loading thrust fatigue crack initiation and propagation in the size of compressive plastic zone.
结果表明，疲劳裂纹是在残余拉应力和循环压应力作用下萌生和扩展的，压塑性变形是裂纹萌生和扩展的必要条件。
Fork failure of a forklift truck mainly takes a form of plastic deformation exceeding allowable limit, fragile breakage and early stage fatigue breakage.
叉车货叉失效方式主要表现为塑性变形超差，脆性断裂和早期疲劳断裂。
Its basic forms are rapture and fatigue, plastic deforming, wearing, holding-on, cold and hot fatigue, etc.
模具失效的基本形式有断裂与疲劳、塑性变形、磨损、咬合、冷热疲劳等。
The specifications for seat sealing test, body sealing test, body strength test, valve long term test, fatigue strength test and operation torque of plastic valves were summarized.
汇总了塑料阀门产品所需性能要求的阀座密封试验、阀体密封试验、阀体强度试验、阀门长期试验、疲劳强度试验和操作扭矩的规定。
Its main wear mechanisms are plastic smearing, abrasive wear and fatigue spalling.
其磨损机理主要有塑性涂抹、磨粒磨损和疲劳剥落。
The modern signal analysis is used to measure the plastic strain in low cycle fatigue in this paper.
在材料低周疲劳过程中，由检测的应变信号，利用现代谱分析技术处理，得到材料疲劳过程的塑性变形并进行实时跟踪。
For the top-and-seat Angle connections considered in the paper, the large fatigue based plastic rotation capacity can be achieved.
对于本文中所研究的顶底角钢连接而言，可以取得较大的塑性转角。
The results show that hot-forged cast dies take thermal wear, plastic deformation, thermal fatigue, impact fatigue fracture and brittle fracture as predominant failure patterns.
结果表明，精铸热锻模的主要失效形式为热磨损、塑性变形、热疲劳裂纹、冲击疲劳破断和脆性断裂。
In addition, the fatigue life decreases after nitrocarburizing, are because the surface hardened layer leads to the plastic behavior loss of a whole material.
另外，共渗处理疲劳寿命的降低是表面强化层造成整体材料的塑性损失的结果。
The result indicates that the improvement of the fatigue limit is due to the nano-crystallization and severe plastic deformation in the surface layer induced by high-energy shot peening.
结果表明，高能喷丸后其表层组织发生严重塑性变形并实现组织纳米化，是提高弯曲疲劳寿命的主要原因。
Randomly distributed models of micro-plastic strains were used to calculate the micro-plastic deformation produced at each cycle of the steel under high cycle fatigue test.
采用金属材料微元屈服极限随机分布模型，计算出每次循环产生的微观塑性应变，并与用单调拉伸试验确定的材料真实断裂延性联系起来。
Both fibers feature plastic cladding to protect the fiber during buffer stripping and prevent breakage, while increasing fiber strength and reducing static fatigue in humid environments.
这两种纤维都具有塑料覆盖，在缓冲条剥落期间保护光纤，防止断裂，同时提高纤维强度和减少在潮湿环境中的静态疲劳。
The result shows that the better fatigue properties are achieved under the fine grain size and the plastic grain boundaries.
结果表明在细晶粒和塑性晶界条件下具有较好的疲劳性能。
The results indicate that, the elastic-plastic mismatch of components has significant influence on the near-tip "driving force" of fatigue crack growth.
结果表明，界面两侧材料的弹塑性失配对复合板面裂纹的扩展驱动力具有重要影响。
A new exponential dissipation model is presented to describe this bilinear material's plastic strain amplitude-fatigue life relation.
利用本文建立的指数衰减模型能够较好地描述材料的非线性塑性应变幅与寿命之间的关系。
In hot impression die forging, the principal modes of die failure are erosion, thermal fatigue, mechanical fatigue and permanent (plastic) deformation.
在热压模缎中，模具失效的主要模式是腐蚀作用、热疲劳、机械疲劳和永久性即塑性变形。
The maximum operating stress is computed and limited to prevent conditions of ratchet(progressive plastic deformation with cycles), and not to fatigue.
也有一个对最大组合应力的限制，持续负载加上位移应力，以限制渐变。
The results indicate that the wear of gauge-rail and the plastic flow are dominant for heavy-haul curve rail, and the fatigue behavior is primary for high-speed rail.
钢轨侧磨与压溃是重载曲线段钢轨的主要损伤类型，而高速铁路钢轨主要表现为疲劳损伤特征；
The results indicate that the wear of gauge-rail and the plastic flow are dominant for heavy-haul curve rail, and the fatigue behavior is primary for high-speed rail.
钢轨侧磨与压溃是重载曲线段钢轨的主要损伤类型，而高速铁路钢轨主要表现为疲劳损伤特征；
应用推荐