Related Experiment Video
Updated: Jul 23, 2025
09:12
A Method for Studying the Temperature Dependence of Dynamic Fracture and Fragmentation
Published on: June 28, 2015
8.6K
Study on Elastic Mixed Mode Fracture Behavior and II-III Coupling Effect.
Xinting Miao1,2, Jinbo Zhang1, Haisheng Hong1
1School of Mechanical Engineering and Rail Transit, Changzhou University, Changzhou 213164, China.
Materials (Basel, Switzerland)
|July 14, 2023
Summary
Coupling effects in mixed mode fracture are clarified. Mode II components drive crack deflection, while mode III components do not influence it, advancing fracture mechanics understanding.
Area of Science:
- Materials Science
- Mechanical Engineering
- Solid Mechanics
Background:
- Mixed mode fracture is extensively researched, but coupling effects remain poorly understood.
- Understanding these effects is crucial for predicting material failure.
- Existing models often overlook the complex interactions at crack tips.
Purpose of the Study:
- To investigate the coupling effects of mixed mode cracks.
- To elucidate the influence of different fracture modes on crack behavior.
- To develop a novel fracture criterion for mixed mode cracks.
Main Methods:
- Finite element analysis for detailed crack tip field simulation.
- Experimental studies to validate numerical models.
- Application of linear elastic fracture mechanics principles.
Main Results:
- II-III coupling effects are consistently observed at mixed mode crack tips.
- Mode II components are identified as the primary driver of crack deflection.
- Mode III components were found to have no significant effect on crack deflection.
Conclusions:
- A new fracture criterion incorporating coupling effects and superposition is proposed.
- The study resolves ambiguities regarding II-III coupling in mixed mode fracture.
- This research contributes to the advancement of fracture mechanics theory and application.
More Related Videos
Related Concept Videos
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
296
Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
296
01:08Bending of Members Made of Several Materials
228
In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
228
01:19Members Made of Elastoplastic Material
125
The behavior of elastoplastic materials under bending stresses, particularly in structural members with rectangular cross-sections, is crucial for predicting material responses and understanding failure modes. Initially, when a bending moment is applied, the stress distribution across the section follows Hooke's Law and is linear and elastic. This distribution means the stress increases from the neutral axis to the maximum at the outer fibers, up to the elastic limit.
As the bending moment...
As the bending moment...
125
01:20Elastic Strain Energy for Shearing Stresses
226
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
226
01:21Plastic Behavior
229
A material's elastic behavior is characterized by the disappearance of stress once the load is removed, allowing the material to return to its original state. However, when stress surpasses the yield point, yielding commences, marking the onset of plastic deformation or permanent set. This change from elastic to plastic behavior is influenced by the peak stress value and the duration before the load is removed. An intriguing observation occurs when a specimen is loaded, unloaded, and...
229
01:20Elasticity in Concrete
117
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
117