复合材料固化相关黏弹性性能演化及残余应力分析
发布时间：2019-03-27 07:41
【摘要】：通过对复合材料固化度和温度相关黏弹性本构方程的分析,定义一个能综合反映固化度和温度等对复合材料黏弹性性能影响的无量纲参数De_m。当参数De_m都大于10~2时,复合材料基体处于流动状态;当参数De_m都小于10~(-2)时,复合材料为弹性状态;仅当部分参数De_m小于10~2而大于10~(-2)时,复合材料处于黏弹性状态。以AS4纤维/3501-6树脂复合材料为例,基于对其参数De_m在典型固化工艺过程中的演化,研究该复合材料黏弹性性能的发展过程,发现基于参数De_m分析得到的凝胶点时间与实验结果一致。根据复合材料黏弹性性能对残余应力发展的影响,将复合材料残余应力计算分为流动阶段和黏弹性阶段,并建立了相应的状态相关黏弹性本构模型。最后通过与原始模型预测结果的比较验证了提出的本构模型,表明本文提出的计算方法与原始黏弹性本构模型计算结果一致,但大大降低了计算所需的时间和存储空间。
[Abstract]:Based on the analysis of curing degree and temperature dependent viscoelastic constitutive equation of composites, a dimensionless parameter De_m. is defined, which can comprehensively reflect the effects of curing degree and temperature on the viscoelastic properties of composites. When the parameter De_m is more than 10 ~ (- 2), the matrix of the composite is in the flow state, and when the parameter De_m is less than 10 ~ (- 2), the composite is in the elastic state. Only when the partial parameter De_m is less than 10 ~ (- 2) and is greater than 10 ~ (- 2), the composite is in viscoelastic state. Taking the AS4 fiber / 3501 / 6 resin composite as an example, based on the evolution of its parameter De_m during the typical curing process, the development process of the viscoelastic properties of the composite was studied. It is found that the gel point time obtained by parametric De_m analysis is in agreement with the experimental results. According to the influence of viscoelastic properties of composite on the development of residual stress, the calculation of residual stress of composite is divided into flow stage and viscoelastic stage, and the corresponding state-dependent viscoelastic constitutive model is established. Finally, the proposed constitutive model is verified by comparing with the prediction results of the original model. It is shown that the calculation method proposed in this paper is consistent with the calculation result of the original viscoelastic constitutive model, but the time and storage space required for the calculation are greatly reduced.
【作者单位】： 武汉理工大学理学院;
【基金】：国家自然科学基金(11202154) 中央高校基本科研业务费专项资金(WUT:2016IB002)
【分类号】：TB33
本文编号：2448004
[Abstract]:Based on the analysis of curing degree and temperature dependent viscoelastic constitutive equation of composites, a dimensionless parameter De_m. is defined, which can comprehensively reflect the effects of curing degree and temperature on the viscoelastic properties of composites. When the parameter De_m is more than 10 ~ (- 2), the matrix of the composite is in the flow state, and when the parameter De_m is less than 10 ~ (- 2), the composite is in the elastic state. Only when the partial parameter De_m is less than 10 ~ (- 2) and is greater than 10 ~ (- 2), the composite is in viscoelastic state. Taking the AS4 fiber / 3501 / 6 resin composite as an example, based on the evolution of its parameter De_m during the typical curing process, the development process of the viscoelastic properties of the composite was studied. It is found that the gel point time obtained by parametric De_m analysis is in agreement with the experimental results. According to the influence of viscoelastic properties of composite on the development of residual stress, the calculation of residual stress of composite is divided into flow stage and viscoelastic stage, and the corresponding state-dependent viscoelastic constitutive model is established. Finally, the proposed constitutive model is verified by comparing with the prediction results of the original model. It is shown that the calculation method proposed in this paper is consistent with the calculation result of the original viscoelastic constitutive model, but the time and storage space required for the calculation are greatly reduced.
【作者单位】： 武汉理工大学理学院;
【基金】：国家自然科学基金(11202154) 中央高校基本科研业务费专项资金(WUT:2016IB002)
【分类号】：TB33
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1 陈航;冯雪;黄银;;带图案软界面的黏弹性分析与实验[A];第十三届全国实验力学学术会议论文摘要集[C];2012年
，本文编号：2448004
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