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Student Understanding Of The Mechanical Properties Of Metals In An Introductory Materials Science Engineering Course

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Conference

2010 Annual Conference & Exposition

Location

Louisville, Kentucky

Publication Date

June 20, 2010

Start Date

June 20, 2010

End Date

June 23, 2010

ISSN

2153-5965

Conference Session

Clearing up Student Misconceptions in Materials

Tagged Division

Materials

Page Count

13

Page Numbers

15.1126.1 - 15.1126.13

Permanent URL

https://peer.asee.org/16432

Download Count

258

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Paper Authors

biography

Rebecca Rosenblatt Ohio State University

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Rebecca Rosenblatt is a graduate research associate in the physics department working towards a PhD in physics education at The Ohio State University. She is currently investigating the evolution of student understanding of force, velocity, and acceleration, and she is working on this project to identify and address student difficulties in learning materials science.

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Andrew Heckler Ohio State University

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Andrew F. Heckler is an Assistant Professor of Physics at Ohio State University. His original area of research was in Cosmology and Astrophysics. In the past eight years, he has focused on Physics Education Research, studying fundamental learning mechanisms involved in learning physics, the effects of representation on learning and problem solving, and the evolution of physics understanding during and after a physics course. As part of the education component of an NSF MRSEC center, he is also leading a project to identify and address student difficulties in learning materials science.

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Abstract
NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Student Understanding of the Mechanical Properties of Metals in an Introductory Materials Science Engineering Course Abstract

We report on initial findings of a project to identify, study, and address student difficulties in a university-level introductory materials science course for engineers. Through interviews of over 80 students and testing of over 300 students, we examined in detail student understanding of the mechanical properties of metals. Here we describe a number of student difficulties in understand- ing macroscopic properties of metals and the effects of simple processing on these properties. For example, many students have difficulty with basic definitions of mechanical properties. These difficulties include the notion that yield strength is independent of the cross sectional area of the material, the difference between the strength of a material and the stiffness of that material, and the actual definition of yield strength and Young’s modulus. Further, only half of the students recognized that drawing a metal through a tapered hole increases its strength and only half again of these students could give a simple, correct explanation as to why. All of these results are after traditional instruction that explicitly covered these topics. In order to address these difficulties, we are in the process of designing and field testing 45 minute in-class active learning group-work lessons, similar in structure and style to lessons shown to be effective in physics education research efforts.

Introduction

An understanding of the definitions of basic mechanical properties is fundamental to understanding materials science. A number of researchers have investigated student understanding of some me- chanical properties such as students’ beliefs about strong materials3 and students’ understanding of strengthening mechanisms behind coldworking4 . In this paper, we add to the existing research on student difficulties with mechanical properites. We study in detail a few concepts including student confusion between mechanical stress and force, and student confusion between stiffness and strength.

All of the data presented here was collected after students received direct instruction and home- work on these topics. The lecturer for the class was an experienced teacher who was aware that students have difficulties with these topics and took steps in class to address these difficulties with slides aimed specifically at the definitions for stress, elasticity, yield strength, and stress strain plots as well as clicker questions and live demos.

Participants and Methods

The participants in this study were enrolled in the introductory materials science engineering course at The Ohio State University, a required core course for many of the engineering major programs. The students ranged from 2nd to 5th year students and about 10% of the students in-

Rosenblatt, R., & Heckler, A. (2010, June), Student Understanding Of The Mechanical Properties Of Metals In An Introductory Materials Science Engineering Course Paper presented at 2010 Annual Conference & Exposition, Louisville, Kentucky. https://peer.asee.org/16432

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