Polymer-based Fabric Core Conveyor Belt Damage Analysis And Residual Strength Reliability Study

While a belt conveyor system is composed of many important parts, none is more economically important than the conveyor belt itself, which is significant in a belt conveyor system to host, tract, and the most critical part of the performance to determine its safety. In most cases, it will represent a substantial part of the initial cost.Polymer matrix- textile conveyor belt is a special composite material with heterogeneity, multi-component, delamination and anisotropic characteristics. On the microscopic scale, which is the component of composite materials result in the structural features significantly; On the macro scale, it is further laminated composite structural of composite materials; at the same time, it prone to damage in its processing and utilizing. Damage will make the mechanical properties deteriorated, reducing life, so the research of the mechanical properties of the conveyor belt structure is inseparable from the analysis of its injury process. The damage of conveyor belt presents the characteristics of multi-scale, multi-stage, multi-mode. Compared to homogeneous isotropic materials and general anisotropic materials, the study of the mechanism of injury and damage evolution becomes more complex and difficult. Thus, according to the true state of the conveyor belt and its laminated structure, the analysis to the study of the mechanical properties and failure mechanism is not only important for the assessment of the impact resistance of polymer matrix composite material and damage prediction, but also has a remarkable engineering significance and application value.The constitutive relation of linear viscoelastic polymer matrix composite materials firstly derived in this paper. Then consider four damage forms of polymer matrix composite materials as fiber failure, matrix cracking, matrix crushing and delamination under impact load. Matrix damage is simulated by solid element and the delamination damage is predicted by cohesive zone model(CZM).In this thesis, we use ABAQUS user subroutine VUMAT, which introduces the criteria of polymer matrix- textile conveyor belt damage and the evolution law after damage into FEM, to simulate the damage of composite laminates under impact loadings. The results obtained prove the computation model, subroutine and criteria correct.We utilizing user defined field subroutine(USDFLD) and user defined material subroutine(UMAT), which introduces the progressive failure of composite into computation, to simulate the ultimate strength of polymer matrix- textile conveyor belt including circular hole under the tension loading.Combine finite element analysis to obtain the response of residual ultimate strength of polymer matrix- textile conveyor belt with damage. The simulated samples of the random variable and the residual ultimate strength were successfully obtained through the orthogonal design. Then, we utilized BP neural network nonlinear mapping function trains to get the explicit expression of residual ultimate strength in response to the random variable. Combined with random perturbation theory and first-order second-moment(FOSM) method, the study analyzed the reliability and its sensitivity of the damaged conveyor belt.Proposed an approach based on convex model of set theory to determine the nonprobabilistic reliability index of the residual ultimate strength of polymer matrix- textile conveyor belt with damage. The sample of residual ultimate strength response of the polymer matrix- textile conveyor belt and uncertain parameter were gained by using libSVM training samples. Finally the ultimate residual strength of polymer matrix- textile conveyor belt implicit regression function to calculate the non-probabilistic reliability of the damaged conveyor belt was replaced.