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首页> 外文会议>ASME International Mechanical Engineering Congress and Exposition >THE INFLUENCE OF THE BAUSCHINGER EFFECT ON THE COMBINED STRESS INTENSITY FACTORS FOR 3-D INTERNAL RADIAL CRACKS IN A FULLY OR PARTIALLY AUTOFRETTAGED GUN BARREL
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THE INFLUENCE OF THE BAUSCHINGER EFFECT ON THE COMBINED STRESS INTENSITY FACTORS FOR 3-D INTERNAL RADIAL CRACKS IN A FULLY OR PARTIALLY AUTOFRETTAGED GUN BARREL

机译：Bauschinger作用对完全或部分自动射枪桶中三维内径裂缝组合应力强度因子的影响

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The influence of the Bauschinger Effect (BE) on K_(IN) - the combined, Mode Ⅰ, 3-D Stress Intensity Factor (SIF) distributions for arrays of radial, internal, surface cracks emanating from the bore of a fully or partially autofrettaged gun barrel is investigated. A thorough comparison between the combined SIFs for a "realistic" -Bauschinger Effect Dependent Autofrettage (BEDA) and those for an "ideal" -Bauschinger Effect Independent Autofrettage (BEIA) is performed. The 3-D analysis is performed via the finite element (FE) method and the submodeling technique, employing singular elements along the crack front. Both autofrettage residual stress fields, BEDA and BEIA, are simulated using an equivalent temperature field and more than 1200 different crack configurations are analyzed. SIFs for numerous crack arrays (n=1 to 64 cracks), a wide range of crack depth to wall thickness ratios (a/t=0.01 to 0.2), various ellipticities (a/c=0.5 to 1.5), several values of the yield-stress to pressure ratio (ψ=σ_(yp)/p=1.93 to 3.55) and different levels of autofrettage (ε=30% to 100%) are evaluated. The level of autofrettage efficiency for all BEDA cases is determined, and is thoroughly compared with that of BEIA. The largest combined SIF K_(Nmax) can be found at any angular location along the crack front and can reach its largest values for arrays of any number of cracks from 1 to 16, and therefore needs to be evaluated for each particular case. The Bauschinger Effect is found to have a dramatic detrimental impact on the fatigue life of the gun barrel. Even in the case were autofrettage has its minimal beneficial effect, (ψ=1.93), the BE can reduce the fatigue life of the barrel by a factor of 2 to 5. In other cases this factor can reach orders of magnitude, and in extreme cases, when autofrettage completely overcomes the pressure yielding a nil K_(Nmax), this factor might become infinite, i.e., an infinite fatigue life for BEIA versus a finite fatigue life for BEDA. For a partially autofrettaged barrel, it is found that the lower the level of autofrettage, the smaller the Bauschinger Effect is. Increasing the level of autofrettage beyond ε=60% is found to be counterproductive, and therefore, it is not recommended.
机译：的包申格效应的影响（BE）上K_（IN） - 合并的，模式Ⅰ，3-d的应力强度因子（SIF），用于从一个完全或部分自紧孔发出的径向，内部，表面裂纹的阵列分布枪管进行了研究。将合并的应力强度因子之间的详细比较，对于“现实” -Bauschinger效应依赖自增强（BEDA），并执行对那些“理想” -Bauschinger效应独立自增强（BEIA）。通过有限元（Fe）方法和子曲线技术进行3-D分析，沿着裂缝前沿采用奇异元素。两个自增强残余应力场，BEDA和BEIA，正在使用的等效温度场模拟以及超过1200种不同裂缝配置进行了分析。应力强度因子为许多裂纹阵列（n = 1至64裂纹），一个宽范围的裂纹深度的壁厚比（A / T = 0.01〜0.2），各种椭圆率（A / C = 0.5〜1.5），的几个值屈服应力到压力比（ψ=σ_（YP）/p=1.93至3.55）和不同水平的自紧的（ε= 30％至100％）进行了评价。自增强效率所有BEDA案件的级别被确定，并与BEIA的深入比较。最大结合SIF K_（Nmax时）可以在沿裂纹前的任何角度位置找到，并且可以针对任何数目从1裂纹的阵列达到其最大值至16，并且因此需要为每个特定的情况下进行评估。包辛格效应被发现对枪管的疲劳寿命的显着不利影响。即使在壳体是自紧具有其最小的有益效果，（ψ= 1.93）时，BE可以通过因子2降低筒的疲劳寿命为5。在其它情况下，这因数可达到数量级，并在极端的情况下，当自紧完全克服了压力，产生一个零K_（Nmax时），这一因素可能成为无穷大，即，无限的疲劳寿命为BEIA与有限疲劳寿命BEDA。对于部分自增强桶，它发现，降低自紧的电平，较小的包申格效应是。增加超出ε= 60％自紧的电平被发现是适得其反的，因此，不建议。

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