Room Temperature, The Large Size Of Zn-22al Alloy Mechanical Properties Of Research And Damping Performance

Zn-22A1 alloy have more suitable characteristics as damping materials such as low defo-rmation stress, high ductility, and no work-hardening. Therefore, Zn-22A1 alloy is a potent-ial material of metal damper, which possesses expansive prospects and practical values in the field of energy absorption. However, few studies at home have been done in the superplastic Zn-22A1 alloy with a large size at room temperature and studies at damping and energy abso-rption are fewer.In this thesis, different processinges are used to obtain the superplastic Zn-22A1 alloy with a large size at room temperature which possesses the needed performance. The tensile, compression and superplasticity of Zn-22A1 alloy with a large size are tested and analyzed. At last, the damping performance of superplastic Zn-22A1 alloy is analyzed by the FEM software.The elongation-to-failure, flow stress, elastic modulus and Poisson's ratio of the Zn-22A1 alloy with different processes and treatment conditions are determined at different strain rates, which are based on tensile tests. The paper shows the largest elongation of 213% at room temperature. The elastic moduluses are influenced on different strain rates, but the influence is little. The paper gives the elastic modulus, Poisson's ratio and shear modulus that can be referred. The minimum and maximum flow stresses achieved are respectively 97Mpa and 365Mpa; the minimum Rp0.2 is 60Mpa and the maximum tensile strength is 374Mpa, which are useful to practical engineering.Based on compression tests, the stress-strain curve, the true stress-true strain curve, compressive flow stresses and non-proportional compression strengths of the Zn-22A1 alloy with different processes and treatment conditions are tested and analyzed at different strain rates. The compressive flow stresses increase with increasing compressive strain rates. Moreover, the minimum and maximum compressive flow stresses achieved are respectively 119Mpa and 313Mpa. In addition, The non-proportional compression strengths increase with increasing compressive strain rates; the minimum Rpco.2 is 118Mpa.Eight-story steel frame is analyzed with dynamic time-history analysis method by the ANSYS that is a FEM software, based on the above test parameters. The earthquake responses are achieved under the common and uncommon earthquakes. The damping performance of the Zn-22A1 alloy is analyzed. And the damping effect of the steel frame with layer upon layer dampers and compartment is compared. The results prove that the plate of Zn-22A1 alloy has an amazed damping performance. The above conclusions by testing and analysis of the FEM software contribute references to design and utilize the plate of the Zn-22A1 alloy damper with a large size.