This work aims to study the notch effect in HDPE pipes. Burst tests were performed on notched pipes of HDPE for different depth ratios a/t to evaluate the burst pressure equivalent to each notch depth. 3D finite elements calculations were performed in the frame of elastic-plastic behavior, to predict the Von-Mises equivalent stress values at different positions of notch vicinity. Critical values of Von-Mises equivalent stress were predicted for different notch shapes and depths, also for different hydrostatic pressure levels. According to the obtained results, burst pressure value depends strongly on the notch depth. Hence, equivalent stress takes its maximum values in the immediate vicinity of the notch and then, gradually decreases through the outer pipes limit.
The objective of this study is to present numerical aspects related to the implementation of the interaction integral method for the purpose of determining the stress intensity factors in mode I and mixed-mode crack problems of functionally graded materials (FGM) and homogenous materials for a different form of cracking. This numerical development is based on the use of the finite element method (FEM), by the coupling of the Ansys-Matlab calculation codes. To validate the accuracy and reliability of the approach, the results obtained will be compared with other numerical results in the literature. The interaction integral method is one of the methods most compatible with the formulation of the finite element method. Therefore, we are interested in this study, in terms of the presentation of necessary steps which allow the resolution of a problem by finite elements for the mechanical problems. It is very important to note that the principle of the implementation of the “Integral M†technique is using scripts based on the coupling of two commercial software.
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