A Prediction Method of Ultimate Load of Vanadium Added Steel Tube Joint Considering the Effect of Warm Coiling
A technology of ultimate load and prediction method, which is applied in the direction of instrument, geometric CAD, design optimization/simulation, etc., can solve the problems such as the danger of the prediction result of the weakening effect of the material, and achieve the effect of safety of the prediction result.
Active Publication Date: 2020-11-24
ZHEJIANG UNIV
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[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a general method for predicting the ultimate load of vanadium-added steel plate-welded barrel joints that can be manufactured by warm plastic forming methods. The defect that the process weakens the strength of the material and causes the prediction result to be dangerously biased
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[0043] With reference to the accompanying drawings, figure 2 The example shown is the implementation object, according to the figure 1 Shown flow process, the present invention is described further.
[0044] figure 2 The example shown is a 2.25Cr-1Mo-0.25V steel plate-welded cylinder joint with an inner diameter of 2400mm and a wall thickness of 152mm. Considering the weakening effect of the 650℃ warm coil forming manufacturing process on the material strength, the service temperature Predict the ultimate load at 450°C to 510°C.
[0045] The realization process of the inventive method is as follows:
[0046] Step 1: Perform a tensile test on 2.25Cr-1Mo-0.25V steel at 650°C, and measure its true stress-strain curve, such as image 3 (a) shown. Simplifying it reasonably, we get image 3 (b) A piecewise linear model of the stress-strain curve shown for the elastoplastic constitutive relation in the numerical simulation of the warm rolling process in step 2.
[0047] Step...
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Abstract
The invention discloses a method for predicting the ultimate load of a vanadium-added steel cylinder joint considering the influence of warm coils. The method adopts tensile test to obtain the yield strength and tensile strength of vanadium-added steel with different pre-plastic deformation at different service temperatures; based on the test data, the neural network technology is used to obtain the strength prediction model of vanadium-added steel; the finite element method is used Predict the residual plastic strain distribution of the barrel section after warm coil forming; then input it into the strength prediction model to obtain the material strength distribution in the barrel section; finally, use the plastic limit analysis technology to realize the prediction of the ultimate load of the barrel section. This method has the advantages of strong operability, low cost, and strong generalization ability. Through a small number of experiments, the influence of the manufacturing process of warm coiling on the ultimate load of the barrel section is taken into account, and it can more reasonably predict the load of the barrel section at different service temperatures. The ultimate load and material strength distribution also provide a scientific method for the optimization of the warm coil forming process parameters and the precise control of the service performance of the barrel section.
Description
technical field [0001] The invention relates to the fields of manufacturing process and limit load prediction of bearing parts, in particular to a method for predicting the limit load of vanadium-added steel plate-welded barrel joints at any service temperature in consideration of the residual influence of warm coil forming. Background technique [0002] Determining the plastic limit of load bearing parts is one of the most important tasks in engineering structure design. However, the existing ultimate load prediction methods only consider the original strength of materials, and do not consider the weakening effect of the bearing part manufacturing process on the material strength. Lean towards danger. Therefore, when predicting the ultimate load of a bearing, it is necessary to take into account the residual effects of its manufacturing process (especially the warm plastic forming process). Contents of the invention [0003] The purpose of the present invention is to ove...
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IPC IPC(8): G06F30/23G06F30/17G06F119/14G06F119/08
CPCG06F30/23G06F30/17G06F2119/06G06F2119/08
Inventor 陈志平李尤张德林马赫
Owner ZHEJIANG UNIV