Mediaspace scheduled maintenance: Aug 25, 2026 07:00 - 12:00 AM. During this time, videos will be temporarily unavailable. Check status updates.

Lecture

Fracture Mechanics: Mixed-Mode Energy Release Rate

In course

ME-437: Advanced solid mechanics

Description

This lecture covers the concept of fracture mechanics, focusing on the energy release rate in mixed-mode loading conditions. The instructor explains the different modes of crack growth, such as opening and shear, and discusses the critical stress intensity factors for each mode. Various asymptotic fields at the crack for general loading are analyzed. The lecture also delves into the topic of anti-plane shear and tearing in brittle materials. Computational modeling of crack growth and delamination problems in fiber-reinforced composites is explored, along with the construction of cohesive zone models. The presentation concludes with a discussion on the direction of crack growth and the critical energy release rate for mixed-mode loading.

This video is available exclusively on Mediaspace for a restricted audience. Please log in to MediaSpace to access it if you have the necessary permissions.

Watch on Mediaspace

Official source

Related concepts (32)

Fracture mechanics

Fracture mechanics is the field of mechanics concerned with the study of the propagation of cracks in materials. It uses methods of analytical solid mechanics to calculate the driving force on a crack and those of experimental solid mechanics to characterize the material's resistance to fracture. Theoretically, the stress ahead of a sharp crack tip becomes infinite and cannot be used to describe the state around a crack. Fracture mechanics is used to characterise the loads on a crack, typically using a single parameter to describe the complete loading state at the crack tip.

Fracture

Fracture is the separation of an object or material into two or more pieces under the action of stress. The fracture of a solid usually occurs due to the development of certain displacement discontinuity surfaces within the solid. If a displacement develops perpendicular to the surface, it is called a normal tensile crack or simply a crack; if a displacement develops tangentially, it is called a shear crack, slip band or dislocation. Brittle fractures occur without any apparent deformation before fracture.

Type system

In computer programming, a type system is a logical system comprising a set of rules that assigns a property called a type (for example, integer, floating point, string) to every "term" (a word, phrase, or other set of symbols). Usually the terms are various constructs of a computer program, such as variables, expressions, functions, or modules. A type system dictates the operations that can be performed on a term. For variables, the type system determines the allowed values of that term.

Fracture toughness

In materials science, fracture toughness is the critical stress intensity factor of a sharp crack where propagation of the crack suddenly becomes rapid and unlimited. A component's thickness affects the constraint conditions at the tip of a crack with thin components having plane stress conditions and thick components having plane strain conditions. Plane strain conditions give the lowest fracture toughness value which is a material property.

Composite material

A composite material (also called a composition material or shortened to composite, which is the common name) is a material which is produced from two or more constituent materials. These constituent materials have notably dissimilar chemical or physical properties and are merged to create a material with properties unlike the individual elements. Within the finished structure, the individual elements remain separate and distinct, distinguishing composites from mixtures and solid solutions.

Related lectures (38)

Fracture Mechanics: Stress Intensity Factor

Explores stress intensity factor in fracture mechanics, crack propagation prediction, and material ténacité.

Action Bar Plugin: Useful Shortcuts for Fiji

Delves into the Action Bar plugin, demonstrating how to create custom toolbars and mini applications in Fiji.

Robotics: Actuation and Mobility Analysis

Covers corrected exercises from the 2020 exam in the field of robotics, including topics such as accuracy, speed, DC motors, optimal gear ratio, dynamics of robot arms, encoders, and kinematics.

Toughness of Materials

Covers the concept of toughness of materials, emphasizing resistance to crack propagation and plastic deformation.

Fracture and Toughness of Materials