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The effect of stitch incline angle on mode I fracture toughness - Experimental and modelling

机译：针迹倾斜角度对I型断裂韧性的影响-实验和建模

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In this study, double cantilever beam (DCB) experiments were conducted to determine the effect of stitch incline angle on fracture toughness. The laminates were stitched with a square wave pattern having a pitch and spacing of 4 mm and three different angles being 0°, 22.5° and 45°. A semi-analytical model for DCB specimens was developed based on the Timoshenko beam theory and validated against the experiment results using a previously developed traction law. The results were also compared against a finite element analysis (FEA).rnThe 0° stitched laminates had a mode I fracture toughness 2.35 times higher than the unstitched laminates at maximum load. The testing showed that increasing the incline angle from 0° to 22.5° and 45° reduced fracture toughness at peak load by 12.2% and 20.2%, respectively. As the crack propagated further, the effect of angle reduced due to the traction laws of higher incline angle having less load but greater displacement. The semi-analytical model predicted loads and displacements within 15% of the experimental results. The accuracy is influenced by the traction law and was more accurate for lower incline angles. This is due to more progressive failure as the angle increases rather than a clean break as the model assumed. The 2D FEA was conducted using the load and traction law determined from the semi-analytical solution. The displacements and crack lengths were within 5% and 8%, respectively, of the semi-analytical results.
机译：在这项研究中，进行了双悬臂梁（DCB）实验以确定缝线倾斜角度对断裂韧性的影响。用具有4mm的间距和间隔以及三个不同的角度为0°，22.5°和45°的方波图案缝合层压板。基于Timoshenko束理论开发了DCB标本的半分析模型，并使用先前开发的牵引定律针对实验结果进行了验证。还将结果与有限元分析（FEA）进行了比较。rn在最大载荷下，0°缝合的层压板的I型断裂韧性比未缝合的层压板高2.35倍。测试表明，将倾斜角从0°增加到22.5°和45°会使峰值载荷下的断裂韧性分别降低12.2％和20.2％。随着裂纹的进一步传播，由于较高倾斜角的牵引定律具有较小的载荷但具有较大的位移，因此减小了倾斜角的影响。半分析模型预测的载荷和位移在实验结果的15％以内。精度受牵引定律的影响，对于较小的倾斜角度更精确。这是由于随着角度的增加，更多的渐进式破坏，而不是模型所假定的彻底破坏。使用从半解析解确定的载荷和牵引定律进行二维有限元分析。位移和裂纹长度分别在半分析结果的5％和8％之内。

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