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中山大学航空航天学院,广东 深圳 518107
Received:10 March 2025,
Accepted:31 March 2025,
Published Online:09 June 2025,
Published:25 September 2025
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周佳銮,张泳柔,尹梓霁等.端面粘接条件下的软材料动态力学行为[J].中山大学学报(自然科学版)(中英文),2025,64(05):35-42.
ZHOU Jialuan,ZHANG Yongrou,YIN Ziji,et al.Dynamic mechanical behavior of soft materials under end-bonded conditions[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(05):35-42.
周佳銮,张泳柔,尹梓霁等.端面粘接条件下的软材料动态力学行为[J].中山大学学报(自然科学版)(中英文),2025,64(05):35-42. DOI: 10.13471/j.cnki.acta.snus.ZR20250049.
ZHOU Jialuan,ZHANG Yongrou,YIN Ziji,et al.Dynamic mechanical behavior of soft materials under end-bonded conditions[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2025,64(05):35-42. DOI: 10.13471/j.cnki.acta.snus.ZR20250049.
工程材料在复杂应力条件下动态力学响应的实验表征非常重要。复合加载实验中,单轴压缩测试要求试件与加载界面间保持低摩擦状态以确保应力测量精度,而剪切/扭转加载则需要高强度界面约束以有效传递载荷。对于具有低弹性模量、高泊松比的软质材料(如硅胶、水凝胶),这种界面约束条件的不兼容性尤为突出,其引起的系统误差可能达到与材料本征力学响应相当的量级。基于分离式霍普金森压杆实验平台,研究了端面粘接约束条件对硅胶动态力学行为的影响。实验结果表明:在端面粘接条件下,试件的表观应力显著提高,且该增强效应随试件长径比增大而上升。为了有效消除端面粘接引入的测量偏差,对比了3种修正理论。分析发现,3种修正方法均能在一定应变范围内消除摩擦干扰引起的伪尺寸效应,表现出良好的修正效果。但在大直径试件的大应变阶段,可能由于接触界面出现材料堆积,导致摩擦条件发生显著变化,3种修正方法均出现了修正偏差。
The experimental characterization of dynamic mechanical responses under complex stress states is crucial for engineering materials. In composite loading experiments, uniaxial compression testing requires minimal interfacial friction between the specimen and the loading surface to ensure the accuracy of stress measurement, while shear/torsion loading necessitates strong interfacial constraints to effectively transmit the load. For soft materials with low elastic modulus and high poisson's ratio (such as silicone rubber and hydrogels), this incompatibility of interfacial constraint conditions is particularly prominent, and the resulting systematic errors can reach a magnitude comparable to the intrinsic mechanical response of the material. Based on the split Hopkinson pressure bar experimental platform, this paper investigates the influence of end-boned constraints on the dynamic mechanical behavior of silicone rubber. The experimental results showed that specimens under end-bonded conditions exhibit significantly enhanced apparent stress amplitudes, with this strengthening effect intensifying as the specimen's aspect ratio increases. To effectively eliminate the measurement deviation introduced by end-bonding, three correction theories were compared. The analysis found that all three correction methods could effectively eliminate the pseudo-size effect caused by friction interference within a certain strain range and showed good correction effects. However, during large-strain stages of specimens with greater diameters, correction deviations occur across all three linear friction correction models, likely attributable to material accumulation at contact interfaces inducing significant changes in frictional conditions.
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