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排序方式: 共有10000条查询结果,搜索用时 31 毫秒
31.
凌树森 《理化检验(物理分册)》1998,34(3):15-18,36
对圆杆在线弹性阶段,弹-塑性阶段和全塑性阶段的扭转剪应力的计算公式作了分析,并推导了在材料的应力-应变关系(τ-γ关系)不服从虎克定律时,扭转真实剪应力的计算公式。文中对扭转强度计算公式的来源,物理含义及其都作了详细的说明。这对执行和理解国家GB10128-88《金属室温扭转试验方法》是有益的,而且对高校中材料力学的教学具有一定的参考价值。 相似文献
32.
由于结构设计的原因,综合性能较好的一些保护方案如横差保护和不完全纵差保护等将不能应用于大型超临界汽轮发电机。文中重点讨论了纵向零序电压保护方案的改进及其在应用中的问题。研究表明,发电机发生匝间短路故障时3次谐波电势减小,而机组外部故障时发电机3次谐波电势增大。因此,为了提高纵向零序电压保护方案的性能,可以根据故障时3次谐波电压增量的特性作为选取制动量的依据,从而提高保护性能。亦即:当3次谐波电压表现为负增量时,制动量取为0或接近0;而当3次谐波电压表现为正增量时,以该增量值作为制动量。此外,对匝间保护纵向零序电压元件增加一个小延时是可行的,它可以提高保护躲暂态3次谐波影响的能力。仿真计算表明,比例制动式纵向零序电压保护能可靠区分内外部故障,符合大型超临界汽轮发电机的保护要求。 相似文献
33.
Indian electric tariffs are characterized by very high rates for industrial and commercial classes to permit subsidized electric consumption by residential and agricultural customers. We investigate the viability of this policy using monthly data for 1997–2003 on electric consumption by a few large industrial customers under the aegis of a small distribution company in the state of Uttar Pradesh. For a given price/cost ratio, it can be shown that if the cross-subsidizing class’ electricity demand is sufficiently elastic, increasing the class’ rates fail to recover incremental cross-subsidy necessary to support additional revenues for subsidized classes. This suboptimality is tested by individually estimating time-variant price-elasticities of demand for these industrial customers using Box-Cox and linear regressions. We find that at least for some of these customers, cross-subsidy was suboptimal prior to as late as October 2001, when rates were changed following reforms. 相似文献
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35.
R.H. Ericksen 《Polymer》1985,26(5):733-746
Creep of Kevlar 29, Kevlar 49 and PRD 49-III fibres was investigated. The fibres exhibited transient creep and the strain-time relationship was represented by a logarithmic time law. The creep strain recovered with time when the load was removed. Upon reloading to the same creep stress the strain-time relationship was again logarithmic but the creep rate was reduced. Modulus measurements were made during the creep test and these showed that the modulus increased with time. This result indicated a crystallite rotation mechanism which could account for the experimentally observed creep strain. Creep in PRD 49-III fibres exhibited a small temperature dependence over the temperature range 20°C to 150°C. The apparent creep activation energy was consistent with the range of values reported for hydrogen bonding. This suggests one possible creep mechanism in which the combined action of stress and thermal activation causes rearrangement of intercrystalline bonds in the crystallite boundaries resulting in boundary creep. Boundary creep allows crystallite rotation which produces the macroscopic creep strain. Boundary creep is discussed in terms of the fibre morphology and a model of delayed elasticity. 相似文献
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38.
以某工程钻爆参数为例,阐述了在地下工程掘进施工中,应用回归分析法建立钻爆参数的相关模型,并利用此模型帮助建立某断面钻爆方案. 相似文献
39.
Shu-Chu Ren Nelson N. Hsu Donald G. Eitzen 《Journal of research of the National Institute of Standards and Technology》2002,107(5):445-473
Pulsed ultrasonic techniques can be and have been used to examine the interface conditions of a bonded structure. To provide a theoretical basis for such testing techniques we model the structure as a layer on top of a half-space, both of different elastic properties, with various interface bonding conditions. The exact dynamic Green’s tensor for such a structure is explicitly derived from the three-dimensional equations of motion. The final solution is a series. Each term of the series corresponds to a successive arrival of a “generalized ray” and each is a definite line integral along a fixed path which can be easily computed numerically. Willis’ method is used in the derivation. A new scheme of automatic generation of the arrivals and ray paths using combinatorial analysis, along with the summation of the corresponding products of reflection coefficients is presented. A FORTRAN code is developed for computation of the Green’s tensor when both the source and the detector are located on the top surface. The Green’s tensor is then used to simulate displacements due to pulsed ultrasonic point sources of known time waveform. Results show that the interface bonding conditions have a great influence on the transient displacements. For example, when the interface bonding conditions vary, some of the first few head waves and regular reflected rays change polarities and amplitudes. This phenomenon can be used to infer the quality of the interface bond of materials in ultrasonic nondestructive evaluation. In addition the results are useful in the study of acoustic microscopy probes, coatings, and geo-exploration. 相似文献
40.