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应力等高线
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  stress contour
     In this paper, a new griding method is introduced to calculate strain and stress contour for rear wheel cover of CA142 truck and the reasons for stamping defects are analyzed.
     本文以CA142汽车后轮罩为对象,利用一种新的网格方法,计算了应变、应力等高线,分析了后轮罩出现冲压缺陷的原因。
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     Stress Chemistry
     应力化学
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     ,Reynolds stress(?) ,(?)
     ,雷诺应力(?)
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     Study of the Spatial Relations of Topographic Contour Lines
     等高线空间关系研究
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     Establishing DEM from Contours
     根据等高线建立数字高程模型
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  stress contour
Stress contour plots are presented for each configuration.
      
Computer simulations and validation of these simulations were developed which fairly accurately represented residual crater shapes/geometries and correlated experimentally measured microhardness maps with simulated residual yield stress contour maps.
      
A second stress contour of 15.6 MPa is first observed at t = 180 sec.
      
A refined stress contour map obtained by neutron diffraction measurements on a plate sectioned weld was compared with the numerical model.
      
Beyond stress contour plots, no details are provided regarding the gusset plate interface loads.
      
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Nosetip is an axisymmterical structure. Three Dimensional Carbon-Ca-rbon (3D C-C) is orthotropic, nonlinear material with different moduli in tension and in compression. SAAS Ⅲ, which is usually used for thermal stress analysis of nosetip made of 3D C-C, was modified in this paper. The modification consists of following aspects. The tensile or compressive modulus used for complex stress state is determined with the signs of fiber bundle stress instead of the signs of the principal stresses. Nonlinear shear stress-strain...

Nosetip is an axisymmterical structure. Three Dimensional Carbon-Ca-rbon (3D C-C) is orthotropic, nonlinear material with different moduli in tension and in compression. SAAS Ⅲ, which is usually used for thermal stress analysis of nosetip made of 3D C-C, was modified in this paper. The modification consists of following aspects. The tensile or compressive modulus used for complex stress state is determined with the signs of fiber bundle stress instead of the signs of the principal stresses. Nonlinear shear stress-strain relationship is taken into consid-eration. Integrity check is also included in computation based on the strength criterion established in authors' previous paper. Graphic plotting function is also improved. Influence of different weave on thermal stress distribution is also discussed in this paper.Finally following conclusions are reached: 1. Nonlinear modellig must be used for thermal stress analysis of nos-etip made of material such 2-2-3 3D C-C, otherwise the stresses on the surface of nosetip will be far too higher than the real ones, especially as far as the shear stress is concerned; 2. The applying stresses might be underestimated if the mean value of moduli taken along a circumference on a transverse cross-section of nosetip is used in computation. If the modulus in principal material direction on transverst cross-section of nosetip is used in compution,the discrepancy will be on the side of safty; 3. If the ratios of fibers in three orthogonal directions are changed,the normal stresses in nosetip will only change a little, while the shear stress will almost remain the same, provided the fiber volume fraction has no change; 4, The computation program NSAAS of this paper is good for the 3D C-C produced in this country, but it should still be improved, for instance the periodical variation of moduli of pricipal material direction in transverse cross-section should be taken into consideration.

用三个正交方向里纤维根数之比为2:2:3所编织成的三向碳/碳材料(2-2-33DC/C)制成的端头帽是双模量非线性轴对称结构。在双线性型、轴对称结构分析的程序SAASⅢ基础上进行了改造。对2-2-3 3D C/C端头帽进行非线性热应力分析。在改进的运序中,用材料主方向的受力状态来确定用拉伸还是压缩模量;考虑剪切非线性行为;增添了2-2-3 3DC/C材料的强度准则以检查结构的安全性;改进了绘图功能,除能画应力等高线外,增加了沿某一曲线,画出应力分布图的功能;改变2-2-3编织为2-2-4和2-2-5编织来讨论不同编织对热应力分布的影响。

Circular grid method appears effective in solving technological problems of large stamping components with complex shape especially of automotive panel. Nevertheless, traditional circular grid method is no longer applicable for shallow stretching components with small forming capacity. In this paper, a new griding method is introduced to calculate strain and stress contour for rear wheel cover of CA142 truck and the reasons for stamping defects are analyzed.

在解决大型复杂形状冲压件,尤其是汽车覆盖件的冲压生产技术问题时,圆网格方法已卓有成效。但对成形量小的浅拉延件,传统的圆网格法已不能满足要求。本文以CA142汽车后轮罩为对象,利用一种新的网格方法,计算了应变、应力等高线,分析了后轮罩出现冲压缺陷的原因。

 
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