38 results about "Thermo elastic" patented technology

A non-contact thermo-elastic property measurement and imaging system and method thereof are described. Acoustic energy is incident on a first surface of a specimen under test. The acoustic energy is converted partially into heat by the specimen, causing a slight increase in the temperature in a region of interaction. The temperature increase is imaged using a high sensitivity infrared camera. Presence of defects (surface and subsurface) in the material modifies the distribution of temperature. An image of temperature distribution can be used for nondestructive testing and evaluation of materials. The temperature change in the specimen caused by acoustic excitation is related to thermal and elastic properties of the material. A measurement of the change in the temperature as a function of the amplitude of incident excitation can be used for direct measurement of thermo-elastic property of the specimen.

The invention provides a laser thermoforming deformation prediction method and system for a hull outer plate, including: step 1: establishing a process window about heat source parameters and plate parameters; step 2: performing multiple sets of thermal elastic-plastic finite element based on the process window Simulate and extract the equivalent inherent strain results; Step 3: Establish a predictive neural network model based on the equivalent inherent strain results, and generalize the equivalent inherent strain results under other process parameters in the process window; Step 4: Combine the equivalent inherent strain results It is given to the model in the form of anisotropic thermal expansion coefficient as the initial property of the model; Step 5: By applying a unit temperature load to the model, ensure that the size and direction of the thermal strain distribution obtained by calculation are the same as the equivalent inherent strain distribution; Step 6: The thermoelastic finite element simulation is performed to obtain the deformation displacement of the material. The invention can quickly solve the deformation results of large-sized plate parts and complex paths, and realizes the automatic laser heating forming processing of the hull outer plate.