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On the use of Brazilian disc specimen for calculating mixed mode I–II fracture toughness of rock materials
No full textExperimental and Theoretical Study of Fracture Paths in Brittle Cracked Materials Subjected to Pure Mode II Loading
No full textCrack growth path was investigated experimentally, numerically and theoretically using two test specimens subjected to pure mode II loading. The specimens were (a) the center cracked circular disc (CCCD) specimen subjected to diametral compression often called the Brazilian disc and (b) the diagonally loaded square plate (DLSP) specimen containing inclined center crack and subjected to pin loading. A few CCCD and DLSP specimens made of two brittle materials (i.e. marble rock and PMMA) were tested under pure mode II conditions. It was observed that the fracture initiation directions and the fracture paths for the tested specimens differed significantly and grew in two different trajectories. However, it was shown that the experimentally observed fracture paths for both specimens can be predicted theoretically very well by using the incremental crack growth method. Several finite element analyses were performed to simulate the whole fracture trajectories of the tested CCCD and DLSP specimens. At each increment, the direction of fracture initiation for the tip of growing crack was determined using the fracture parameters (i.e. stress intensity factors and T-stress) based on the modified maximum tangential stress (MMTS) criterion. The main difference in the fracture trajectory was found to be related to the magnitude and sign of the fracture parameters (which depend strongly on the specimen geometry and loading configuration) and also the type of tensile or compressive loading in the CCCD and DLSP samples.</jats:p
Mode I and Mode II fracture assessment of green asphalt pavements containing plastic waste and RAP at low and intermediate temperature
No full textThis study aimed to assess the cracking resistance of an asphalt mixture incorporating a PET-based additive (PBA) obtained from recycled Polyethylene Terephthalate (PET) and a high proportion of reclaimed asphalt pavement (RAP) at low and intermediate temperatures under various fracture modes (pure mode I and II) to achieve two significant aims means to reduce harmful effects of accumulation of PET wastes and design resistant pavement. This study blended PBA in different dosages (1–3 %) with asphalt binder. RAP was added to the asphalt mixture in different content (25 and 50 % aggregate weight). After fabricating cylindrical specimens corresponding to the various mixture types, SCB specimens were obtained from cylindrical specimens. Fracture tests were conducted in different loading conditions regarding different fracture modes at low and intermediate temperatures. Results demonstrate that adding PBA to asphalt pavement can increase cracking resistance at low and intermediate temperatures in different fracture modes. Moreover, based on the results across various indices and under different loading and temperature conditions, adding up to 25 % RAP to the mixture interacts effectively with PBA, leading to increased crack resistance. Among all tested mixtures, the combination of 2 % PBA and 25 % RAP yielded the best performance. Comprehensive statistical analysis also confirms the results of this study in both modes of fracture and temperature conditions
The effect of combined mechanical load/welding residual stress on mixed mode fracture parameters of a thin aluminum cracked cylinder
No full textWide range data for crack tip parameters in two disc-type specimens under mixed mode loading
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