Theoretical And Experimental Research On Mechanical Properties Of Structural Rock Wool Metal Faced Sandwich Panel

The new core material structural rock wool is produced through the special craft processing and patent technology of three-dimensional fiber spiral arrangement. Compared with the common rock wool, it has better advantage in mechanical properties. As a kind of composite structure, metal faced sandwich panel is composed of two thinner but stronger facings and one thicker core material in-between. Its structural characteristics make it posses light weight and stiffness advantages. So the sandwich panel taken the structural rock wool as core material will have very good mechanical properties. But there is little research about it at home and abroad now.Focusing on the failure modes which the new sandwich panel often occurs in practical engineering, this paper has made a research about it through experimental method and theoretical method. These work can provide theoretical guidance for the production and application of sandwich panel and reference for the preparation of national regulation. The main content of this research is summarized as follows:The theory of single-span simply supported sandwich panel under the uniformly distributed load is studied. The theoretical formulas of metal faced sandwich panel with structural rock wool core are obtained in serviceability limit state and load-bearing limit state.This paper has completed the test about the mechanical properties of structural rock wool, and got its compressive strength, tensile strength, and corresponding modulus of elasticity. These test results provide the foundation for theoretical calculation of sandwich panel. In addition, according to the comparison of the experiment, the test results show that the structural rock wool has better mechanical advantage than the common rock wool.To prove the validity and suitability of the theoretical formulas of structural rock wool sandwich panel, this paper has completed the vacuum loading tests with 18 blocks of structural rock wool sandwich panels and corresponding common rock wool sandwich panels under the uniformly distributed load. Through the comparison of test results with theoretical results, their consistency is received and the correctness of the theoretical formulas is proved. In the same condition, the test results show that the failure load of structural rock wool sandwich panel is higher than common rock wool sandwich panel. In addition, the structural rock wool sandwich panel has a lot of redundant load-bearing capacity and better ductility when its deflection is over 1/200 of span because of the high modulus of core material.