Strength, ductility and toughness are three extremley important, closely related material properties. The yield and ultimate strengths tell us how much stress a material can withstand, and are often used to define failure. Ductility tells us how much plastic deformation a material undergoes before fracture. Brittle materials fracture at very small strains, and can often fail catastrophically. Toughness tells us how much energy a material can absorb before fracture. It is closely linked to both strength and ductility.
Type of Material:
The author of this resource has created a fantastic video with high quality animations.
Recommended Uses:
This resource can be best used as a supplmental material that allows users to identify key material properties on a stress-strain curve. It could be recommended for courses on mechanical properties of materials in civil and mechanical engineering degrees. Useful for traditional and hybrid/blended teaching
Technical Requirements:
Tested and can open on Edge, Chrome, Firefox, and even on the YouTube app on the phone.
Identify Major Learning Goals:
The major learning goals for this work is to clearly define and identify material properties such as yield strength, ultimate tensile strength, toughness, and ductility on stress-strain curves. The video is addressed to students of civil and mechanical engineering degrees interested in learning about material’s properties.
Target Student Population:
High School, College Upper and Lower Division, Professional
Prerequisite Knowledge or Skills:
Pre-requisite knowledge of general materials and mechanical concepts such as stress and strain.
Content Quality
Rating:
Strengths:
The content is delivered extremely clearly and correctly. The video is extremely high quality and the animations and graphics here are stellar and contribute to the clarity of instructions. The main similarities and differences of the properties of a material such as strength, ductility and toughness are presented. In the respective property, different behaviours of materials are shown. The video explains how the yield and ultimate strengths tell us how much stress a material can withstand and are often used to define failure. Ductility tells us how much plastic deformation a material undergoes before fracture. Brittle materials fracture at very small strains and can fail catastrophically. Toughness tells us how much energy a material can absorb before fracture. It is closely linked to both strength and ductility. Contents is presented in a clear and concise manner. The contents are core concepts in basic mechanical engineering courses. Information is provided accurately and summarizes well the main ideas.
Concerns:
No concerns.
Potential Effectiveness as a Teaching Tool
Rating:
Strengths:
Extremely useful in describing this topic and to visualize these properties in stress-strain curve. The material could be used for self-learning as well as a supplementary material in traditional or blended/hybrid courses on mechanical properties of materials. The learning objectives are clearly stated. Relations and differences amongst the strength, ductility and toughness are demonstrated graphically, easy to understand.
Concerns:
The video is short in scope and users may need to watch previous videos for context of stress-strain curves. As corresponds to video materials, to become useful for effective learning it should be combined with extra exercises and quizzes, or to become integral part of additional lectures on the topic of mechanics.
Ease of Use for Both Students and Faculty
Rating:
Strengths:
Very easy to wach and visualize. The video is captioned as well for accessiblity. The video is a standalone material, easy to use. Only connection to the Internet and link to the video repository is needed. It can be reproduced in computer, iPad and smartphone. Visual design of the video corresponds to a succession of pictures as the explanations are given.
Concerns:
As corresponds to video materials, limited interactivity.
Creative Commons:
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