Numerical Simulation Of Dynamic Crack Propagation In Concrete Component

As the tensile strength of concrete is lower, crack will apear in it for the effect of inner tensile stress. Almost all the concrete componets work with cracks. On accout of its complicate strain rate and inertia effects, the dynamic crack propagation of concrete has many differences from static crack propagation. What’s more, the theory of dynamic crack propagation is not perfect and its experiment has larger discrete. Therefore, the simulating of crack propagation about concrete with offset notch under the effect of load has great practice signification in the safe and design of practical engineering. In this paper, with the finite element software LSDYNA, the main work are finished as follows:First, two typical failure process of three-point bending beam with offset notch are realized with damage model and elastic-plastic model. By comparing the numerical results with the experimental and numerical calculation results, the accuracy of this method is verified.Second, the impact of dynamic crack propagation on the sample are discussed when offset notch is placed at different locations. Conclusions are obtained as follows: when offset notch is in different lateral locations and the loding P is certain, crack inclination increases first then decreases with the distance between offset notch and loading point incresing. The failure time of the sample increases first then decreases with the distance between offset notch and loading point incresing. When offset notch is placed at diffrent vertical locations and the loding P is certain and the offset notch closes to the loading point, the failure time of the sample increases. But it has no effect on the inclination of crack propagation.Third, the impact of dynamic crack propagation on the sample are discussed when offset notch is in different lengths. Conclusions are obtained as follows: when the location of offset notch in longitudinal and the loading P is certain, the paths of crack propagation of different lengths of offset notchs in longitudinal are the same and the direction of crack propagation is towards loading point vertically. When the location ofoffset notch in longitudinal and the loding P are certain, the different lengths of offset notch in longitudinal have no effect on the failure time of speciman.Fourth, the impact of different offset notch widths on the dynamic crak propagation is discussed. Conclusions are obtained as follows: when the position of offset notch and looading P are certain, the width has impact on the path of crack propagation.And the crack inclination increases with the width incresing. And the width has no effect on the failure time.Fifth, the impact of different offset notch heights on the dynamic crak propagation is discussed. Conclusions are obtained as follows: when the position of offset notch and looading P are certain, the height has impact on the path of crack propagation. The crack inclination decreases with the height incresing. And the failure time of sample decreases with the height increasing.Sixth, the impact of different elastic modulus on the dynamic crak propagation is discussed. Conclusions are obtained as follows: when the position of offset notch and loading P are certain, the elastic modulus has no impact on the path of crack propagation,ie crack inclination is almost certain. And the failure time of speciman increases with the elastic modulus increasing.