破坏应力

The relation between the AIRT and stress in dry rock is not simply in corresponding state like damp rock, but the obvious AIRT rise and change of thermal images of dry rock were found during instantaneous fracture.

干燥砂岩AIRT与应力的关系不是简中的对应关系，但在破坏瞬间出现显著的增温现象和热像特征的明显变化。

It was revealed that the average infrared radiation temperature of damp rock increases with loading and keeps its change in step with the stress, and that the fluctuation of AIRI is much less, The AIRT increment of damp rock is higher than that of dry rock under unit load before destabilization and the fact shows that water will intensify the infrared radiation from loaded rock, but no obvious change was found on thermal image during the instantaneous fracture of damp rock.

结果表明：潮湿岩石加载过程中平均红外辐射温度随载荷增加呈上升趋势AIRT与应力的变化步调一致，曲线波动较小；岩石失稳前单位载荷下潮湿岩石的升温幅度高于干燥岩石，水对岩石受力时的红外辐射具有明显推动作用，但破坏瞬间热像特征变化不很明显。

Drill endures complicated alternative stress in the well during drilling process, it will produce breakage after using a period of time, this will bring artesian well a huge economic loss.

在钻井过程中，钻具在井下承受着复杂的交变应力的作用，经过一段时间的使用后则会产生破坏，这给钻井生产带来巨大的经济损失。

This model has been applied to simulate the crack extension in three point bending creep test.

应用该模型，对三点弯曲蠕变试验中裂缝的扩展过程进行了有限元计算，发现裂缝扩展随时间的变化与应力—应变曲线的形状，尤其是强度破坏点以后的曲线形状密切相关。

A new failure criterion and elastic\|plastic constitutive relation for concrete under biaxial stresses is discussed in this paper.

讨论了混凝土在双向应力作用下的破坏准则和弹塑性本构关系。

The size of the blast pit, the damage area, pressure contour and stress-time curve in concrete with or without steel composite were analyzed. Also, the damage mechanism of concrete-steel plate composition under explosive loading was studied.

通过实际算例，比较研究了混凝土敷设钢板与否对成坑大小、损伤区、压力云图以及应力时程曲线等的影响，进一步研究了有钢板加固时混凝土在爆炸荷载作用下的破坏机理。

Brittle fracture mechanism of butt welding in web connections under severe earthquakes is analyzed and studied based on the results of calculation.

计算结果分析表明，梁翼缘对接焊缝在循环荷载作用下脆断破坏的原因是焊缝两端存在着严重的应力集中，且焊缝处于三向受力状态。

Original cracks are obtained by directional fracture with the slotted cartridge. This paper discusses the normal law and mode of crack propagation and analy...

研究了爆炸载荷下的裂纹起裂、发展和止裂的动态扩展行为，分析了其破坏模式、动态应力强度因子及裂纹扩展速度

Marc this paper carried out a finite element numerical simulation on the forming process of cold extruding for the starlike sleeve of constant speed cardan joint of car. The interrelated technological problems of numerical simulation were discussed in detail, the variation curve of extruding force during the course of loading, the cloud chart, which varies along with time, of temperature field distribution of workpiece, the equivalent plastic strain cloud chart of workpiece and the stress distribution cloud chart of diem inner ring were obtained thus explained fairly nice the reason of fatigue damage of dies.

Marc对轿车等速万向节星形套冷挤压成型过程进行了有限元数值模拟，详细讨论了有关数值模拟技术问题，得出了挤压力在加载过程中的变化曲线、工件随时间变化的温度场分布云图、工件等效塑性应变云图及模具内圈的应力分布云图，较好地解释了模具疲劳破坏的原因。

The maximum stress theory was combined with failure index of strength. Tensile strength of laminates was obtained on the analysis of 0° ply.

使用最大应力准则和强度破坏指标相结合的方法，根据主承力层的失效得到层合板的抗拉强度。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。