Abstract
Abstract This article provides the prediction of fracture loads in single edge notched bending (SENB) specimens made of short glass fiber reinforced polyamide 6 (SGFR-PA6) and containing U-notches. The predictions are obtained through the combination of the equivalent material concept and the theory of critical distances (TCD). The latter is based on the material critical distance (L) and has a linear-elastic nature. This implies that in those materials exhibiting non-fully linear-elastic behavior, the determination of the material critical distance requires a calibration process that may be performed by fracture testing on notched specimens or through a combination of fracture testing and finite elements simulation. This represents a significant barrier for the application of the TCD on an industrial level. The proposed methodology defines an equivalent linear-elastic material on which the TCD may be applied through its basic formulation and without any previous calibration of the corresponding critical distance. It is applied to SGFR-PA6 SENB specimens, providing accurate predictions of the experimental fracture loads.
Highlights
The analysis of the fracture behavior of materials and structural components containing notches is the subject of extensive research
It can be observed that the predictions provided when using the equivalent material concept (EMC)-theory of critical distances (TCD) methodology are mostly located within the ±20 % error lines, clearly capturing the physics of the notch effect in these particular materials
The EMC-TCD criterion has been applied for the prediction of fracture loads in an SGFRPA6 material with different amounts of fiber content and containing U-shaped notches.The analyzed materials have no fully linear-elastic material on their tensile curves, something that implies a mandatory time-consuming calibration process when the fracture behavior of this type of material is analyzed using the TCD
Summary
The analysis of the fracture behavior of materials and structural components containing notches is the subject of extensive research. There are numerous practical situations where the defects responsible for structural failures are not crack-like defects In such cases, it is generally over-conservative to proceed on the assumption that the defects behave like sharp cracks, given that notched components develop a load-bearing capacity that is greater than that developed by cracked components. It is generally over-conservative to proceed on the assumption that the defects behave like sharp cracks, given that notched components develop a load-bearing capacity that is greater than that developed by cracked components This particular nature of notches makes it necessary to develop specific approaches for the fracture analysis of this type of defects. When the material behavior is not fully linear-elastic, the application of the TCD requires the fracture testing of notched specimens, finite elements (FE) modeling, or both, in order to calibrate the material parameters involved This makes it difficult to apply the TCD on an industrial level
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