| 1. | New low cycle fatigue life criterion under nonproportional loading
新的多轴非比例加载低周疲劳寿命估算公式 |
| 2. | Recent advances of multiaxial high cycle fatigue under nonproportional loading
多轴非比例加载高周疲劳研究进展 |
| 3. | Low - cycle fatigue life prediction under multiaxial non - proportional loads
多轴非比例加载低周疲劳寿命预测方法的研究 |
| 4. | New low cycle fatigue life criterion under nonproportional loading based on critical plane methods
新的非比例加载低周疲劳寿命估算方法 |
| 5. | For the multiaxial proportional loading , the dispersion degree of fatigue cracks was low
在多轴比例加载条件下，裂纹分布的分散性较小。 |
| 6. | For the nonproportional loading the dispersion become larger with the phase difference increasing
在非比例加载条件下，随著相位差的增大，分散性增大。 |
| 7. | Second , a few methods presented by some scholars were used to calculate the elasto - plastic strains and stresses at the notch tip subjected to proportional loading . at the same time , a new method is proposed to calculate the stresses and strain for the same specimen
第二，针对多轴比例加载的情况，对缺口件采用了多种已有的方法进行了弹塑性应力应变的计算，并提出了一个新的计算公式。 |
| 8. | In recent years , pro f bazant has been devoting to the work ofmicroplane theory microplane theory a theory on the basis of micro - mechanics , has excellent ability of describing not is iv only the concrete constitutive behaviors under non - proportional load but also the damage behavior of concrete under multi - axial stresses
著名学者z . p . bazant教授近十年一直致力于微平面理论的研究，该理论对于描述混凝土在非比例加载下的本构行为和混凝土在多轴应力作用下的损伤行为具有优势。 |
| 9. | In fact , the constitutive models employed in both methods could not re - produce the dynamic behaviour of soil to non - proportional cyclic loading , such as waves loading . to simulate dynamic responses of elastic , visco - elastic and elasto - plastic sea beds , linear and / or non - linear numerical models based on generalized biot ' s theory are developed together with stable and effective algorithm . the difficulty in numerical computation made the generalized biot ' s theory be difficult to be put into practice in the field of geotechnical engineering
上述两种方法采用的土体本构模型都不能再现砂土在暴风浪等非比例加载条件下的动力特性，本文基于广义biot理论提出了波浪作用下海床线性或非线性动力响应的耦合计算模型与稳定、高效数值算法，分别针对土的弹性、粘弹性与弹塑性本构关系，对海床的动力响应进行了有限元数值模拟与分析。 |
| 10. | Then , the techniques of neural networks are also applied to the constitutive modeling of concrete . the main benefits in using a neural - network approach are that all behavior can be represented within a unified environment of a neural network and that the network is built directly from experimental data , i . e . , the network is presented with experimental data and learns the relationships between stresses and strains
其次，利用神经网络理论代替传统的力学方法，直接从试验数据出发，分别建立了在三轴单调比例加载、三轴循环比例加载、常规三轴单调加载和常规三轴轴向循环加载情况下混凝土的神经网络本构模型。 |
