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quasi static load
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  准静态载荷
     Traditional thermal stresses analyses consider thermal load as static load or quasi static load. When the temperature field of the structure varies drastically,these analyses can not satisfy the real need. A finite element method is presented for solving the response of structure under dynamic thermal load (including thermal impulse).
     传统的热应力分析是把热载荷当作静态或者准静态载荷来处理 ,在工程实际中如果温度的变化非常剧烈 ,则该方法不能满足需要 ,本文提出了一种结构在动态热载荷 (包括热冲击 )作用下响应的有限元求解方法 ,算例表明该方法是可行的、正确的。
短句来源
     Quasi static load, wave moment composing, main methods of linear and nonlinear hydroelasticity,symmetry and unsymmetry response, frequency/time domain solutions, slamming response, random wave load are discussed systematically.
     讨论了准静态载荷、波浪弯矩组成成分、线性和非线性水弹性理论的主要方法 ,对称响应和反对称响应、频域和时域求解方法 ,以及砰击响应、随机波浪载荷 .
短句来源
  “quasi static load”译为未确定词的双语例句
     Results and Conclusion The experiment on the pressured pipeline under quasi static load has established a theoretic foundation for the analysis. Reliable analytic method and improtant technical parameters are provided for the evaluation of impact robustness of high pressured pipeline with fluid medium and their safety design.
     结果和结论 压力管道耐撞性静载实验研究为理论分析奠定了基础 ,为输送高压流体介质管网的耐撞性评价和安全设计提供了可靠的分析方法和重要的技术参数
短句来源
  相似匹配句对
     On Work of Quasi-Static Process
     关于准静态过程的功
短句来源
     The Quasi-Static Analysis of TLP
     张力腿平台拟静态分析
短句来源
     QUASI?STATIC LOADING AND CONTROL FOR STRUCTURAL TEST
     结构拟静力加载实验方法及控制
短句来源
     To reduce the computational time, the speed of quasi-static loading is increased.
     为了减少计算时间,采取了提高准静态加载速度的方法.
短句来源
     On the Quasi-Life
     论准生命——寻找剖析生命伦理疑难问题的“奥卡姆剃刀”
短句来源
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  quasi static load
The experimentally verified quasi-static load sharing is incorporated into a Monte Carlo simulation for tensile strength modeling.
      
The crashworthiness requirements are sub-divided into static/quasi-static load requirements and CEM requirements.
      
In order to determine suitable quasi-static load levels, several specimens were subjected to a series of increasing quasi-static loads.
      
Each of the three spans was tested to failure by applying quasi-static load cycles.
      
Each of the three decks was tested to failure by applying quasi-static load cycles.
      


A difficult element of the classical plasticity theory is the concept of the yield surface which leads to experimental and numerical difficulties when attempting to describe and analyze the two or three dimensional response of a material, valanis circumvented this difficulty by developing the theory of endochronic plasticity which does not require the concept of yield for the description of plastic behavior of materials. Recently considerable attention has been paid to the validity, computational capability...

A difficult element of the classical plasticity theory is the concept of the yield surface which leads to experimental and numerical difficulties when attempting to describe and analyze the two or three dimensional response of a material, valanis circumvented this difficulty by developing the theory of endochronic plasticity which does not require the concept of yield for the description of plastic behavior of materials. Recently considerable attention has been paid to the validity, computational capability .and predictive power of the endochronic plasticity, which is caused mainly by the fact that all applications of the theory have, so far, been limited to the homogeneous fields in quasi-static loading. To circumvented the mathematical difficulty for application of the endochronic constitutive equationwhere z is intrinsic time scale and p(z)a kernel function with weak singularity of the origin, an new endochronic elastoplastic constitutive equation has been develot ped. keeping in mind that the derivative of the heaviside step function H(z)is the Dirac delta function δ(z) andThen we can approximately take ρ(z) asThis form of ρ(z) is continuous and differentiable in (0,∞). we, therefore, can obtain the following new elastoplastic endochronic constitutive equationEq. (4) is a three dimensional constitutive equation, which can be specified and expressed as matrix form in. terms of {σ}, {ε} and {h} for particular case. Take plane problem as an example it can be reduced to eq. ( 5 ) by supposing the plastic incompressibility,where{D}is an adequate approximation to the elastic matrix{E}, {H}is a nonlinear part of eq. ( 5 ), which is history dependent and determined by z, ρ(z) and hardening function f(ζ). It was found that three terms in eq. ( 3 )suffice to describe the material response and ct, ai can be determined by the curve fitting in the following region from simple tensile test.over which ρ(z)decays very fast from singularity to a negligible value, while f(ζ)is a well-behaved slowly varying function and can be determined outside the region .A numerical algorithm based on the finite element method of analysis of the boundary value problem in a continuum is presented, in the case where the elastoplastic response of the material is given by the new constitutive equation. It was found that this algorithm is more convenient for calculation than that of classical plasticity, in which the concept of yield surface has taken a very important role.By designing a special experiment and a finite element mesh(the smallest gague and element are equal in size and about 0.2 mm), the validity of the new elastoplastic constitutive eqation of the endochronic plasticity and the algorithm developed in this work are tested in the case of a complex boundary value problem nvolving a highly heterogeneous elastoplasiic strain field in a reclangi lar plate, with notches symmetrically placed with respect to longitudinal axis of symmetry. The plates were loaded cyclically in the direction of this axis .Excellent agreemen between experimental and calculated results is shown along two perpendicular direct i ,r.s in the notch tip for a cyclic history up to three reversals.The present results could have a wide scope of application in different branches of solid mechanics, for instance, elastoplastic structure analysis, fracture and fatigue. The examples of the applicaticn and some predicted and verified new phenomenon will be reported later.The work was finished under the guidance of Professor R. C. valanis, the author would like to express his deepst gratitute to him.

为了克服经典塑性理论发展中的困难,K.C.Valanis于1971年提出了内蕴时间塑性理论。并随之在金属、土壤等不同材料和不同力学问题(如单调及循环加载、蠕交、松驰等)的分析中获得了较为满意的结果。但是除波传播的情况有其特殊性外,其应用范围仅限于均匀应变场。本工作首先得到了新型的内蕴时间弹塑性本构方程,发展了相应的算法和材料函数确定方法,从而首次将内时理论应用于非均匀弹塑性应变场的分析。试验验证是对含对称分布的长边缘缺口板受对称循环载荷的条件下进行的,并使用了小至0.2毫米左右的应变片与有限元单元。结果表明:在沿缺口前缘两个垂直方向上的应变分布的理论计算值与试验结果在趋势上吻合很好。

The authors arc quite certain that there do not exist previously published experimental data onthe impact characteristics of aluminium-lithium alloy in China.In this paper, the authors employ split Hopkinson pressure bar technique to do impact testing ofChinese 8090 (nearly the same as ASTM 8090) aluminium-lithium alloy. The specimens are loadedunder impact loading in which the strain rates arc about 103/s and quasi-static loading in which thestrain rates are about 10-3/ s. For comparison,...

The authors arc quite certain that there do not exist previously published experimental data onthe impact characteristics of aluminium-lithium alloy in China.In this paper, the authors employ split Hopkinson pressure bar technique to do impact testing ofChinese 8090 (nearly the same as ASTM 8090) aluminium-lithium alloy. The specimens are loadedunder impact loading in which the strain rates arc about 103/s and quasi-static loading in which thestrain rates are about 10-3/ s. For comparison, the testing of Chinese LY12 (nearly the same asASTM 7075) aluminium alloy arc also done. The stress and strain curves for both materials areshown in Fig.5. It can be seen that the stress-strain curve is always higher under impact loading thanunder quasi-static loading.The increase is greater for Chinese 8090 than for Chinese LY12. In otherwords, Chinese 8090 is more sensitive to strain rate than Chinese LY12. The results also show thatthe Chinese 8090 can withstand higher loading than Chinese LY12 under both impact andquasi-static loading over tested deformation.

采用Hopkinson杆技术,对8090铝锂合金材料的冲击压缩特性进行了实验研究,并与传统的LY12铝合金进行了比较.实验结果表明:不论是在准静态情况还是冲击载荷情况下,在试样变形相同时,8090铝锂合金比LY12铝合金可承受更高的压应力;并且8090铝锂合金对应变率要比LY12铝合金敏感.

The prediction of geometric features of surface crack fatigue growth andfracture growth is one of important projects in the;Leak-Before-Break assessment methodology.In this paper,the law of surface crack fracture growthunder quasi-static loading is experimentally studied with the multiple-specimenmethod.The testing procedure and tested results are presented.

表面裂纹疲劳扩展和断裂扩展过程中几何形貌的预测是未爆先漏(LeakBefore-Break)评判理论研究的一个重要课题。本文用多试件法研究了表面裂纹准静态断裂扩展形貌变化规律,介绍了主要试验方法与试验结果。

 
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