3results about How to "Change mechanical properties" patented technology

The invention relates to the field of metal material surface modification, in particular to a method for improving the laser shock peening effect of nickel-based alloy through a pulsed magnetic field. Comprising the following steps: S1, carrying out multivariate analysis on a pulsed magnetic field process by adopting a support vector regression algorithm, establishing a relation model between magnetic field process parameters and the strength and plasticity of a nickel-based alloy sample, and carrying out key parameter identification on a regression fitting model of the support vector regression algorithm by utilizing a physical information neural network, the optimal pulsed magnetic field process parameters are obtained; s2, testing the elastic modulus and Poisson's ratio of the nickel-based alloy sample treated by the optimal pulsed magnetic field process parameters by using a static test method, and calculating laser shock parameters; and S3, the nickel-based alloy sample to be treated is subjected to pulsed magnetic field pretreatment under the optimal pulsed magnetic field technological parameters, and then laser shock peening treatment is conducted through the laser shock parameters at the same time. The uniformity and the influence depth of the surface strengthening effect of the metal material can be improved.

The application discloses a kind of polylactic acid-based polyurethane and its preparation method and application, the polyurethane is with polyester polyol and L-lactide ring-opening polymerization to obtain diblock prepolymer, again with dicyclohexyl methane diisocyanate reaction and be prepared multi-block polyurethane;Wherein, the polyester polyol is PriplastTM 3238.The polyurethane body of the application has superior mechanical properties and excellent hydrophobic capacity, has excellent bonding performance after being used as adhesive and can be maintained bonding ability underwater.Solve the contradiction that existing polyurethane adhesive pollutes environment, the mechanical properties and adhesion of body cannot be taken into account, effectively prolong the service period of adhesive, make it show great application potential in many fields.