Related Experiment Video
Updated: Nov 17, 2025
07:37
Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
9.9K
Dynamic crack growth along heterogeneous planar interfaces: Interaction with unidimensional strips
Alizée Dubois1,2, Daniel Bonamy1
1Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France.
Physical Review. E
|February 19, 2021
Summary
Fast crack propagation in materials with changing toughness is studied. Standing crack front waves control crack speed evolution, showing specific scaling dependent on material properties and fracture speed.
Area of Science:
- Solid mechanics
- Materials science
- Dynamic fracture mechanics
Background:
- Dynamic fracture involves complex crack front behaviors.
- Periodically evolving toughness influences crack propagation.
- Crack front waves are crucial in fast fracture regimes.
Purpose of the Study:
- To theoretically and numerically investigate fast tensile crack propagation.
- To analyze the role of crack front waves in dynamic fracture.
- To understand the influence of periodically evolving toughness on crack dynamics.
Main Methods:
- Theoretical analysis of crack propagation dynamics.
- Numerical simulations of dynamic fracture.
- Analytical examination of short-time and long-time limits.
- Investigation of parameter dependencies.
Main Results:
- Crack front waves propagate at speeds below Rayleigh wave speed.
- Standing front waves dictate the spatiotemporal evolution of local crack front speed.
- Observed a specific scaling form for crack front speed evolution.
- Identified parameter dependencies including strip wavelength and toughness contrast.
Conclusions:
- Crack front wave behavior is critical in dynamic fracture of materials with evolving toughness.
- The study provides insights into the scaling laws governing crack speed.
- Findings are generalizable to unidimensional strips of arbitrary shape.
Related Concept Videos
01:15Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity
409
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.
409
01:12Transformation of Plane Strain
355
When analyzing elongated structures like bars subjected to uniformly distributed loads, it is essential to understand the transformation of plane strain when coordinate axes are rotated. This transformation helps to assess how material deformation characteristics vary with orientation, which is crucial in materials science and structural engineering.
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
Under plane strain conditions, typical for members where one dimension significantly exceeds the others, deformations and resultant strains are...
355
01:20Microcracking in Concrete
284
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
284
01:29Three-Dimensional Analysis of Strain
438
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
438
01:23Behavior of Concrete Under Compressive Load
392
Concrete exhibits specific behaviors under different compressive loads. Understanding this is crucial for understanding its structural integrity. When concrete undergoes uniaxial compression, it tends to develop cracks that run parallel to the direction of the force. These parallel cracks stem from localized tensile stresses that occur perpendicular to the compression direction. Additionally, angled cracks may appear due to the formation of shear planes.
As the concrete specimen fractures under...
As the concrete specimen fractures under...
392
01:21Deformations in a Transverse Cross Section
438
When a material is subjected to uniaxial stress, it elongates or contracts in the direction of the applied force, and also undergoes changes in the perpendicular directions. This behavior is crucial for understanding how materials behave under stress and is governed by mechanical properties such as Poisson's ratio v, which measures the ratio of transverse strain to axial strain.
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
As the material stretches, it expands or contracts in orthogonal directions to the load. This phenomenon varies...
438