An Investigation On Buckling Behavior And Surface/Core Disbonds Problem For SPS Composite Plate

SPS composite plate is a new structural materials, It is regarded as an excellent alternative to both stiffened steel and reinforced concrete and delivers high stiffness to weight ratio, simpler fabrication, improved performance and increased safety. SPS structures such as ships, bridges, sport stadiums, floor systems and blast walls can be designed and produced using industry standard techniques.In recent years, domestic and foreign scholars have done considerable researches in this type of sandwich structure, involving static properties,dynamic properties and fatigue damage research areas and including analytical method, experimental method and numerical research methods.In China, the research of SPS composite plate mainly focused on the design and evaluation of Ship structure.However, the pure research was rare in the mechanical properties. Therefore, in this study,SPS composite plates that laboratory Independently developed were taken as research object,and the buckling behavior, surface/core disbonds problem were deeply investigated in experimental and numerical methods.Details are as follows:1. For the specimens of defect-free and defect-containing SPS composite plate,the lateral pressure buckling experiment was investigated, and the Parameters of lateral pressure, the critical buckling load, postbuckling behavior and failure mode were determined.2. Using the ABAQUS finite element software, Eigenvalue buckling and nonlinear buckling analysis of defect-free and defect-containing specimens were calculated, and studied the influence of different geometrical imperfection on carrying capacity of materials. The numerical method solved the problem that test results were seriously affected by defects, and qualitative analysis of buckling problem is more accurate.3. For the SPS composite plate specimens having two different elastic modulus cores, DCB and SLB test was investigated. Their strain energy release rates were measured, and the type Ⅰ and type Ⅱ critical strain energy release rate was isolated and solved by using the virtual crack closure technique(VCCT).4. Based on ABAQUS, DCB and SLB tests of SPS composite plate specimens were Simulated by using the VCCT. Compared with experimental results, the accuracy of type Ⅰ and type Ⅱ critical strain energy release rate, that obtained by Experimental analysis, was Verified.