Experimental And Theoretical Study Of The Bending Properties Of The New Sandwich Panels

With the continuous development of China, applications of energy-savinginsulation building are imperative. China is vigorously carrying out the scientificresearch on the energy-saving and thermal insulation structures, developing newenergy-saving technologies, using new energy-saving materials, and developing avariety of efficient insulation materials. The domestic and overseas uses ofenergy-efficient building are majority of composite building products such assandwich panels currently. This paper intends to studies the bending properties ofthe sandwich panels. This paper studies two new types of sandwich panels those arecalcium silicate sandwich panels and self-locking composite sandwich panels.Firstly, bending theoretical study are got basing on the sandwich’s forcecharacteristics in this paper. Using the wolfel approximate thinking method,deformation formula is got for the calcium silicate sandwich panel under load.calcium silicate sandwich panels are served as two parts which deform phasecoordinate and take the corresponding load. Then the internal forces anddeformation differential equations of calcium silicate sandwich panel are got, andthen the single-span sandwich panel deformation calculation formula and bearingcapacity formula under uniformly distributed load and concentrated load are derivedcombining the form of load and boundary conditions. Self-locking compositesandwich panels are served as two cores connected panels. Constitutive relations aregot. Basing on the minimum potential energy principle, single span pinch compositesandwich panel deformation formula and bearing capacity formula under uniformloads and concentrated loads are deduced.Then the load-displacement curves are got using the finite element softwareABAQUS to simulate calcium silicate sandwich panels and the self-lockingcomposite sandwich panels. The load-displacement curve of sandwich panel withdifferent calcium silicate board thickness, concrete layer thickness, sandwich panellength and other parameters are analyzed. The finite element results and thecalculation method results are compared in this paper. The results show that thefinite element results and the calculation results coincide well.Lastly, bending performance test of two sizes of calcium silicate sandwichpanels and one size pinch composite sandwich panels are done, from which thespecimen load-displacement curve are got. This paper analyzed the bendingperformance of failure modes of each specimen, deflection and cracking. Based onexperimental and theoretical analysis results, this paper compare experimentalresults with the simplified calculation method results and the finite element results, which verify the theoretical formulas and the finite element simulations are feasible.