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首页> 外文期刊>Composite Structures >Experimental and numerical investigation of the tension and compression strength of un-notched and notched quasi-isotropic laminates
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Experimental and numerical investigation of the tension and compression strength of un-notched and notched quasi-isotropic laminates

机译：无缺口和缺口准各向同性层压板的拉伸和压缩强度的实验和数值研究

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摘要

Un-notched and notched (in the form of through-thickness open holes), quasi-isotropic AS4/3501-6 laminate coupons were tested in tension and compression. Basic lamina properties were also determined experimentally. Numerical analyses using linear elastic and progressive damage approaches were conducted. The linear elastic model either significantly underestimated (first-ply failure approach) or overestimated (last-ply failure approach) the strength of un-notched laminates. The progressive damage approach was able to predict accurately the un-notched strength, providing that the non-linear shear behaviour was accounted for and appropriate failure criteria used. It was also demonstrated that the progressive damage approach could be implemented, with satisfactory accuracy and efficiency, for open-hole strength prediction using basic material degradation laws, a shell element model and widely available commercial FEM software (ABAQUS). This is of practical use for industrial applications. In addition, for the purpose of comparison, a characteristic distance approach was also applied to the open-hole strength problem. It was found that using a linear analysis with a properly defined secant shear modulus this approach gave an accurate prediction, however at least one measured value of notched strength is still required for calibration using this approach.
机译：通过拉伸和压缩测试准各向同性的AS4 / 3501-6层压试片的未刻痕和刻痕（以厚度通孔的形式）。基本层板特性也通过实验确定。使用线性弹性和渐进损伤方法进行了数值分析。线性弹性模型要么明显低估了（无第一层破坏方法），要么高估了（无最后一层破坏方法）无缺口层压板的强度。渐进式损伤方法能够准确地预测无缺口强度，前提是要考虑到非线性剪切行为并使用适当的破坏准则。还证明了使用基本的材料降解规律，壳单元模型和广泛使用的商用FEM软件（ABAQUS），可以以令人满意的精度和效率实施渐进式破坏方法，以进行裸眼强度预测。这在工业应用中具有实际用途。另外，出于比较的目的，特征距离方法也被应用于裸眼强度问题。已经发现，使用具有适当定义的割线剪切模量的线性分析，该方法给出了准确的预测，但是，使用该方法进行校准仍需要至少一个缺口强度的测量值。

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