strain roll
1.Concerns the analysis of the shear strength and the strain of viscoelastic adhesive single lap joint when tension load time rate to fracture varies The authors believe that there is a close relation between the viscoelasticity of the adhesive layer and the stress concentration level of single lap joint It is shown that in case of tention loading test of single lap joint, shear strength and strain depend on the time rate of loading and the viscoelasticity of adhesive layer plays a important roll in it
3.The cage roll forming process of ERW pipes is quite complicated, which involves geometry nonlinearity, material nonlinearity and boundary nonlinearity. In order to understand the deformation behavior of sheet metals better and avoid product defect, a large deformation elastic-plastic finite element model of ?273mm weld pipe cage forming mill, based on the Updated Lagrangian method, is established and simulated through adopting dynamic explicit algorithm. Roll flower, transverse effective plastic strain, and longitudinal strain of the deformed strip at different forming sections are obtained.
4.The explicit finite element method(FEM) based on the varying time-step was selected to analyse the dynamic roll-pass process; the nodes on the leading face of the steady-state elements set was extracted and projected onto a plane to give the required mesh, also called the origin mesh; the implicit FEM was selected to analyses the inter-pass transient thermal process; a geometric part from the mesh was generated and meshed by using the quadrilateral elements, a heat transfer analysis was selected to transfer the node temperature data; a new model was created by using hexahedral elements, mapping the node temperature and the equivalent plastic strain on the integration points.
