查询词典 Multiaxial

The prior cycles with higher axial stress and larger strain range greatly restrains ratchetting strain of subsequent cycling with lower ones. Creep behavior plays an important role in the ratchetting strain and its influence on ratchetting behavior can not be neglected. Fracture morphology characteristics of two kinds of materials were investigated by scanning electron microscope. It shows that failure of material A is induced by cavitation and that of material B is induced by decohesion. For material A, with the decreasing strain amplitude the fracture surface shows more larger diameter globular particles under uniaxial loading and can be seen more obvious and deep crack under multiaxial loading. However for material B, with the decreasing strain amplitude fracture surface shows larger and larger scalelike shape and becomes more smooth under uniaxial loading, but fracture surface under multiaxial loading looks like more smooth than that of uniaxial loading, and shows gradually wave-like morphology.

通过扫描电子显微镜研究表明：材料A为空穴引起的失效，材料B为剥离导致疲劳破坏；随着载荷幅值的减小，材料A在单轴载荷下，断口表面浮出更多更大直径的球状颗粒，而多轴载荷下，可以看到很深的裂纹；随着载荷幅值的减小，材料B在单轴载荷下，断口表面鱼鳞片越来越大，表面越来越平整，而多轴载荷与单轴载荷相比，断口表面看上去更加平整，并且随着载荷幅值的减小，断口逐渐呈现波浪形貌；通过微观的傅立叶变换红外光谱分析，结果表明随着应变幅值的增加，无论载荷是单轴还是多轴状态下，橡胶材料吸光度比值随着幅值的增加而增加，这说明体系中的结晶含量也随之增加。

The results showed that most multiaxial fatigue cracks were initiated and propagated along the direction of maximum shear plane.

利用扫描电镜对疲劳试样的外表面和疲劳断口进行观察，研究了多轴疲劳裂纹萌生和扩展规律，发现裂纹基本上沿着最大剪切平面萌生和扩展。

Some suggestions are made for future studies on multiaxial fatigue on composites. Finally, multiaxial fatigue experimental methods on composites and some of their difficulties are summarized.

最后， 对目前常用的复合材料多轴疲劳实验方法进行了总结，并指出了各种方法的优缺点及其实验中存在的困难。

One-axial loads as well as proportional and nonproportional multiaxial loads such as torsion and bending with and without phase shift (d= 0 deg and d=90 deg) were applied to the welded conxtruction samples.

一轴向负载，以及成比例和nonproportional multiaxial象扭并且有和没有相移(d = 0 度和d = 90 度)弯曲那样装被用于被焊接的conxtruction 样品。

Some important conclusions were obtained, and a new theory of multiaxial damage fatigue and the life prediction models were presented. First, based on the multiaxial fatigue experimental researches, the characteristic of cyclic stress-strain relation was studied deeply under multiaxial proportional and nonproportional loading.

本文在综述目前国内外多轴疲劳研究成果的优点与不足的基础上，从工程应用角度出发，在试验和理论两个方面深入研究了多轴疲劳损伤与寿命预测问题，得到了一些重要试验结果，在此基础上提出了新的多轴疲劳损伤理论及寿命预测模型。

In order to describe the fatigue damage characteristic under multiaxial proportional and nonproportional loading, a new nonlinear multiaxial fatigue damage cumulative model was presented on the basis of combining multiaxial fatigue damage characteristic. The recurrence formula of multiaxial fatigue damage model was derived under multilevel loading.

为了描述多轴比例与非比例加载下的疲劳损伤特性，结合多轴疲劳损伤的特点，建立了一种新的非线性多轴疲劳损伤累积模型，并推导给出了该疲劳损伤累积模型在多级加载条件下的递推公式。

Third, the stress-strain and damage parameters on multiaxial fatigue damage critical planes were analyzed. A new multiaxial fatigue damage parameter was presented. This parameter can not only describe multiaxial proportional and nonproportional loading, but also uniaxial loading.

第三，对多轴疲劳损伤临界面上的应力应变及损伤参量进行了分析，在此基础上提出了一种新的多轴疲劳损伤控制参量，该参量不仅能够描述多轴比例与非比例加载下的疲劳损伤，而且可以退化成单轴的形式。

Analysis of microstructure fracture surface showed that fracture surface was similar to uniaxial fracture surface under multiaxial proportional loading, and the mixed fracture surfaces were found under multiaxial nonproportional loading.

微观断口分析表明，多轴比例加载下的断口形貌与单轴疲劳情况相似；非比例加载下，则以混合断口特征出现。

To numerically simulate the stress-strain response of the components under multiaxial cyclic load- ing,an elastoplastic finite element analysis was adopted to thin tubular specimens under multiaxial proportion- al and nonproportional tension/torsion loading at high temperature.

为数值模拟构件在多轴循环加载下的应力应变响应，利用ANSYS分析软件对承受高温2轴比例与非比例循环拉扭加载下的光滑薄壁管件进行了弹塑性有限元分析。

Based on the critical approach, a model for multiaxial fatigue life prediction was established by combining maximum shear strain and normal strain on the critical plane, and the effect of stress state under the multiaxial cyclic loading condition on the fatigue life was taken into account.

通过对薄壁圆管和缺口试样的高温多轴疲劳寿命特性分析，基于临界面方法提出了一个的多轴疲劳寿命预测模型，在考虑临界面上最大剪应变和正应变对多轴疲劳损伤贡献的同时，还引入了应力状态对多轴疲劳寿命的影响因素。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。