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首页> 外文会议>PVP-vol.493; American Society of Mechanical Engineers(ASME) International Mechanical Engineering Congress and Exposition; 20051105-11; Orlando,FL(US) >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：包辛格效应对完全或部分自残炮筒中3D径向向内裂纹的复合应力强度因子的影响

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摘要

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：鲍辛格效应（BE）对K_（IN）的影响-Ⅰ型，3-D应力强度因子（SIF）的组合分布，用于从完全或部分自动装填的孔产生的径向，内部，表面裂纹阵列枪管进行了调查。对“现实的”-与鲍林斯效应有关的自动玻璃钢（BEDA）和“理想的”-与鲍林斯效应有关的自动玻璃钢（BEIA）的组合SIF进行了全面比较。通过有限元（FE）方法和子建模技术执行3-D分析，并沿裂纹前沿采用奇异元素。使用等效温度场模拟了自动补强残余应力场BEDA和BEIA，并分析了1200多种不同的裂纹形态。 SIF适用于众多裂纹阵列（n = 1至64条裂纹），宽范围的裂纹深度与壁厚之比（a / t = 0.01至0.2），各种椭圆率（a / c = 0.5至1.5），多种值评估了屈服应力与压力之比（ψ=σ_（yp）/p=1.93至3.55）和不同水平的自动加强（ε= 30％至100％）。确定所有BEDA案例的自动增强效率水平，并将其与BEIA进行彻底比较。可以在沿着裂纹前沿的任何角度位置找到最大的组合SIF K_（Nmax），并且对于1到16个任意数量的裂纹阵列，可以达到最大组合SIF K_（Nmax），因此需要针对每种特定情况进行评估。发现包辛格效应对枪管的疲劳寿命具有极大的有害影响。即使在自动强化的最小有益效果（ψ= 1.93）的情况下，BE也会将枪管的疲劳寿命降低2到5倍。在其他情况下，BE可以达到数个数量级，在极端情况下在这种情况下，当自动强化完全克服产生零K_（Nmax）的压力时，该因素可能变为无限，即BEIA的疲劳寿命为无限，而BEDA的疲劳寿命为有限。对于部分自动装桶的桶，发现自动玻璃纤维装填的水平越低，包辛格效应越小。将自动强化的水平提高到ε= 60％以上会适得其反，因此不建议这样做。

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