We consider the nonlinear viscoelastic–viscoplastic behavior of adhesives. We develop a one-dimensional nonlinear model by combining Schapery’s nonlinear single integral model and Perzyna’s viscoplastic model. The viscoplastic strain was solved iteratively using the von Mises yield criterion and nonlinear kinematic hardening. The combined viscoelastic–viscoplastic model was solved using Newton’s iteration and implemented into a finite element model. The model was calibrated using creep-recovery data from bulk adhesives and verified from the cyclic behavior of the bulk adhesives. The finite element model results agreed with experimental creep and cyclic responses, including recoverable and permanent strain after load removal. Although the contribution of the viscoplastic strain was small, both viscoplastic and viscoelastic components of strain response were required to describe the adhesive creep and cyclic response.

我们考虑了粘合剂的非线性粘弹性-粘塑性行为。我们通过结合Schapery的非线性单积分模型和Perzyna的粘塑性模型来开发一维非线性模型。使用冯·米塞斯屈服准则和非线性运动学硬化来迭代求解粘塑性应变。使用牛顿迭代法求解了粘弹-粘塑性组合模型，并将其实现为有限元模型。使用来自散装胶粘剂的蠕变恢复数据对模型进行了校准，并从散装胶粘剂的循环行为进行了验证。有限元模型结果与实验蠕变和循环响应一致，包括载荷去除后的可恢复应变和永久应变。尽管粘塑性应变的贡献很小，