Stress Concentration Of Multi-angled Heterological Laminate For Buckling

Given the orthotropy of laminae, stress concentration still dominates in some of pragmatic engineering stacks, which seemly preserves accommodation for theoretical study. This paper dwells upon the approaches of complex field and finite element method to unravel how ellipse existence influences stress distribution. namely, stress field of quasi-inverse method decides fiber distribution and coupled field of temperature-humidity of characterizing constitutive equations.The exact dissertation establishes concrete and strict theoretical derivations for buckling and stress concentration problems of laminates, which mainly includes:(1) Assume that in-plane even-distributed and shear stresses cause bucklingThe fact that laminate has structural difference of sizes to beam or bar and layering pattern is non-unidirectional makes it a phenomenon that unsynchronized directional deformation breaks the original in-plane balance and develops a newly stable out-plane state which is a cause of warping with deformation in normal direction.(2) Assume that structural holes influence stability of systemHole coordinates, sizes and types will affect stress distribution, further, the irreversible plastic deformation as from post-buckling or deflection re-distribution in selected domain happens.(3) Assume that laminate still accords with minor deformationIf co-work of in-plane compression and shear stresses equals to supposition of individual action under the condition of minor deformation, stress concentration problems should be treated as resultant effect of combined factors.Through enough source-providing and existed theoretical achievements in archives, while referring to laboratory results, thus:(1) Give out ways to study buckling problems of multi-angled heterological laminate under complex force conditions.Considering the severe anisotropy of laminate, pre-take the assumption that the process of buckling satisfies supposition and then verify its feasibility and reliability.(2) Give out processed ways to stress concentration of laminateComputational equations are realized by means of complex field and finite element method, and generalize factors which could affect stress distribution.(3) Put forward the relation between critical load value of laminate stability and hole existenceThrough a study of hole coordinates, sizes and types to critical load value of stability, analyze and put forward quantitative relations.(4) Speculate on self-defined ways to process laminate study.