Enhanced Learning of Mechanical Behavior of Materials via Combined Experiments and nanoHUB Simulations: Learning Modules for Sophomore MSE Students

2015 ◽  
Vol 1762 ◽  
Author(s):  
Aisling Coughlan ◽  
David Johnson ◽  
Heidi A. Diefes-Dux ◽  
K. Anna Douglas ◽  
Kendra Erk ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Conceptual Understanding ◽  
Engineering Students ◽  
Md Simulations ◽  
Tensile Tests ◽  
Testing Laboratory ◽  
Crystalline Materials ◽  
Learning Modules ◽  
Materials Engineering ◽  
Enhanced Learning

ABSTRACTUndergraduate materials engineering students have difficulty conceptualizing the atomic-level processes responsible for plastic deformation. To aid in developing this conceptual understanding, interactive molecular dynamics (MD) simulations were introduced into the sophomore-level materials curriculum, integrating simulation with the traditional tensile testing laboratory. Students perform a tensile test using MD simulations on nanowire samples, and then compare these results with those from the physical tensile tests to develop a visual and more intuitive picture of plastic deformation of crystalline materials.

The Continuing Effort to Enhanced Learning of Mechanical Behavior of Materials via Combined Experiments and nanoHUB Simulations: Learning Modules for Sophomore MSE Students

MRS Advances ◽  
2016 ◽  
Vol 1 (56) ◽  
pp. 3721-3726 ◽  
Author(s):  
Aisling Coughlan ◽  
Heidi A. Diefes-Dux ◽  
Kerrie A. Douglas ◽  
Tanya A. Faltens ◽  
David Johnson
Keyword(s):  
Plastic Deformation ◽  
Materials Science ◽  
Md Simulations ◽  
Tensile Tests ◽  
Metal Nanowires ◽  
Science And Engineering ◽  
Learning Modules ◽  
Physical Laboratory ◽  
Materials Science And Engineering ◽  
Enhanced Learning

AbstractThis paper outlines updates to and evaluation of a learning module that incorporates a molecular dynamics (MD) simulation tool with a physical lab to introduce students to the atomic-level processes that are responsible for plastic deformation. Sophomore materials science and engineering (MSE) students at Purdue University get experience with both a physical laboratory, where they perform and analyze tensile tests of macroscopic samples, and a simulation laboratory, where they run and analyze MD simulations of tensile tests of metal nanowires. By integrating these two activities and discussing reasons for the large difference in yield stress, students may build an intuitive feel for how plastic deformation is linked across length scales

scholarly journals Efektivitas Penggunaan Modul Berbasis Differentiated Instruction untuk Meningkatkan Kemampuan Pemahaman Konsep Matematika Mahasiswa

2019 ◽  
Vol 6 (2) ◽  
pp. 136-148
Author(s):  
Triana Harmini
Keyword(s):  
Differentiated Instruction ◽  
Conceptual Understanding ◽  
Engineering Students ◽  
Student Characteristics ◽  
Wilcoxon Test ◽  
Teaching Material ◽  
First Semester ◽  
Learning Modules ◽  
The University ◽  
Different Characteristics

Teaching material is an essential component of learning. Teaching materials for Calculus courses, especially for the Department of Informatics, remains limited and orients towards a collection of materials and questions that cannot overcome the differences in student characteristics. Therefore, in the form of learning modules that can accommodate variations in student characteristics is a crucial need in teaching material. In this study, the learning module based differentiated instruction was compiled by taking into account the different characteristics of student ability levels. This study aimed to determine the effectiveness of Calculus learning by using learning modules based on differentiated instruction to students' conceptual understanding of the material of qualities and inequalities of absolute value. This research was experimental research and the subjects were the Informatics Engineering students of the University of Darussalam Gontor, enrolled in the first semester in the academic year 2018-2019. The research instrument was tests of conceptual understanding consisting of short-answer problems given at the beginning and the end of learning. The design of this study used One-Group Pretest-Postest Design and data analysis involved a Wilcoxon test due to the small number of subjects (25 people). The results of the analysis showed that the use of the learning modules based on differentiated instruction effectively enhanced the mathematical conceptual understanding of students.

scholarly journals Dynamic Steady State by Unlimited Unidirectional Plastic Deformation of Crystalline Materials Deforming by Dislocation Glide at Low to Moderate Temperatures

Metals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 66 ◽  
Author(s):  
Javier Gil Sevillano
Keyword(s):  
Plastic Deformation ◽  
Steady State ◽  
Flow Stress ◽  
Plastic Strain ◽  
Strain Range ◽  
Tensile Tests ◽  
Crystalline Materials ◽  
Dislocation Glide ◽  
Strength Limit ◽  
Unidirectional Plastic

This paper presents an outline of the quest for the mechanical steady state that an unlimited unidirectional plastic strain applied at low to moderate temperature is presumed to develop in single-phase crystalline materials deforming by dislocation glide, with particular emphasis on its athermal strength limit. Fifty years ago, the study of crystalline plasticity was focused on the strain range covered by tensile tests, i.e., on true strains less than unity; the canonic stress–strain behavior was the succession of stages I, II, and III, the latter supposedly leading to a steady state defining a temperature and strain rate-dependent flow stress limit. The experimentally available strain range was increased up to Von Mises equivalent strains as high as 10 by the extensive use of torsion tests or by combinations of intermittent deformations by wire drawing or rolling with tensile tests during the 1970s. The assumed exhaustion of the strain-hardening rate was not verified; new deformation stages, IV and V, were proposed, and the predicted strength limit for deformed materials was nearly doubled. Since the advent of severe plastic deformation techniques in the 1980s, such a range was still significantly augmented. Strains of the order of several hundreds were routinely reached, but former conclusions relative to the limit of the flow stress were not substantially changed. However, very recently, the plastic strain range has allegedly been expanded to 105 true strain units by using torsion under high pressure (HPT), surprisingly for some common metals, without experimental confirmation of having reached any steady state. This overview has been motivated by the scientific and technological interest of such an open-ended story. A tentative explanation for the newly proposed ultra-severe hardening deformation stage is given.

scholarly journals Influence of Hydrostatic Extrusion on the Mechanical Properties of the Model Al-Mg Alloys

2021 ◽  
Author(s):  
Aleksandra Towarek ◽  
Wojciech Jurczak ◽  
Joanna Zdunek ◽  
Mariusz Kulczyk ◽  
Jarosław Mizera
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Tensile Strength ◽  
Microstructural Analysis ◽  
Tensile Tests ◽  
Hydrostatic Extrusion ◽  
Microstructure Formation ◽  
Initial State ◽  
Degree Of Deformation ◽  
Al Mg Alloys

AbstractTwo model aluminium-magnesium alloys, containing 3 and 7.5 wt.% of Mg, were subjected to plastic deformation by means of hydrostatic extrusion (HE). Two degrees of deformation were imposed by two subsequent reductions of the diameter. Microstructural analysis and tensile tests of the materials in the initial state and after deformation were performed. For both materials, HE extrusion resulted in the deformation of the microstructure—formation of the un-equilibrium grain boundaries and partition of the grains. What is more, HE resulted in a significant increase of tensile strength and decrease of the elongation, mostly after the first degree of deformation.

Influence of Severe Plastic Deformation on the PLC Effect and Mechanical Properties in Al 5XXX Alloy

2006 ◽  
Vol 114 ◽  
pp. 171-176 ◽  
Author(s):  
Joanna Zdunek ◽  
Pawel Widlicki ◽  
Halina Garbacz ◽  
Jaroslaw Mizera ◽  
Krzysztof Jan Kurzydlowski
Keyword(s):  
Mechanical Properties ◽  
Plastic Deformation ◽  
Grain Size ◽  
Severe Plastic Deformation ◽  
True Strain ◽  
Tensile Tests ◽  
Size Reduction ◽  
Hydrostatic Extrusion ◽  
Stress Strain ◽  
Chatelier Effect

In this work, Al-Mg-Mn-Si alloy (5483) in the as-received and severe plastically deformed states was used. Plastic deformation was carried out by hydrostatic extrusion, and three different true strain values were applied 1.4, 2.8 and 3.8. All specimens were subjected to tensile tests and microhardness measurements. The investigated material revealed an instability during plastic deformation in the form of serration on the stress-strain curves, the so called Portevin-Le Chatelier effect It was shown that grain size reduction effected the character of the instability.

Teaching MSE Students to Teach

2016 ◽  
pp. 444-470 ◽  
Author(s):  
Catherine G.P. Berdanier ◽  
Tasha Zephirin ◽  
Monica F. Cox ◽  
Suely M. Black
Keyword(s):  
Iterative Process ◽  
Engineering Students ◽  
Materials Science ◽  
Department Heads ◽  
Design Based Research ◽  
Implementation Model ◽  
Materials Engineering ◽  
Technical Programs ◽  
Faculty Department

The purpose of this chapter is to show how design-based research (DBR) methodologies can be implemented in technical programs. First, the authors provide a background of recent research in interdisciplinary education, Integrative Graduate Education Research Traineeship (IGERT) programs, and design-based research. Second, a brief summary the example case, a Pedagogy module which has been implemented with Materials Science and Materials Engineering students through an IGERT program, is discussed. The final portion of the chapter presents a new implementation model for DBR along with recommendations and strategies for interested faculty, department heads, or motivated graduate students to reform existing technical curricula using design-based research. The significance of the book chapter rests in the flexibility of this model to be adapted to any program, showing instructors the iterative process for developing a course to suit the needs of a department.

Teaching MSE Students to Teach

2015 ◽  
pp. 369-396
Author(s):  
Catherine G.P. Berdanier ◽  
Tasha Zephirin ◽  
Monica F. Cox ◽  
Suely M. Black
Keyword(s):  
Iterative Process ◽  
Engineering Students ◽  
Materials Science ◽  
Department Heads ◽  
Design Based Research ◽  
Implementation Model ◽  
Materials Engineering ◽  
Technical Programs ◽  
Faculty Department

The purpose of this chapter is to show how design-based research (DBR) methodologies can be implemented in technical programs. First, the authors provide a background of recent research in interdisciplinary education, Integrative Graduate Education Research Traineeship (IGERT) programs, and design-based research. Second, a brief summary the example case, a Pedagogy module which has been implemented with Materials Science and Materials Engineering students through an IGERT program, is discussed. The final portion of the chapter presents a new implementation model for DBR along with recommendations and strategies for interested faculty, department heads, or motivated graduate students to reform existing technical curricula using design-based research. The significance of the book chapter rests in the flexibility of this model to be adapted to any program, showing instructors the iterative process for developing a course to suit the needs of a department.

Introduction to Tensile Testing

2004 ◽  
pp. 1-12
Keyword(s):  
Plastic Deformation ◽  
Data Analysis ◽  
Uniaxial Tension ◽  
Tensile Testing ◽  
Tensile Tests ◽  
True Stress ◽  
Stress Strain ◽  
Engineering Applications ◽  
Test Methodology ◽  
Ultrasonic Techniques

Abstract Tensile tests are performed for several reasons. The results of tensile tests are used in selecting materials for engineering applications. Tensile properties often are used to predict the behavior of a material under forms of loading other than uniaxial tension. Elastic properties also may be of interest, but special techniques must be used to measure these properties during tensile testing, and more accurate measurements can be made by ultrasonic techniques. This chapter provides a brief overview of some of the more important topics associated with tensile testing. These include tensile specimens and test machines; stress-strain curves, including discussions of elastic versus plastic deformation, yield points, and ductility; true stress and strain; and test methodology and data analysis.

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