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ENME Undergraduate Course Description: ENES 220

For more information about the Undergraduate Program in Mechanical Engineering, contact: Dr. Sami Ainane Director of Undergraduate Programs ainane@umd.edu

ENES 220 - Mechanics of Materials
Engineering Science

Designation: Required

Course Description:

Second course of a two-semester sequence in solid mechanics. Stress and deformation of beams, shafts, columns, tanks, and other structural, machine, and vehicle members. Topics include stress transformation using Mohr’s circle, centroids and moments of inertia, shear and bending moment diagrams, derivation of elastic curves, and Euler’s buckling formula. A design project related to this material is given.

Prerequisite(s): ENES 102, MATH 141, and PHYS 161

Textbooks

• Design Analysis of Structural Elements, 4th Ed., Dally and Bonenberger, College House.
• Problems: Statics and Mechanics of Materials, Bonenberger and Dally, College House.

Course Objectives

In this course, the student will develop and/or refine the following areas of knowledge:

• Stresses and deflections in shafts
• Centroids and moments of inertia for plane areas
• Stresses in beams – bending and shear
• Beam deflections using singularity functions and superposition
• Statically indeterminate shafts and beams
• Stress transformation and principal stresses using Mohr’s circle
• Stress analysis under combined loading – 2D and 3D
• Column analysis s

Topics Covered

• Forces – 2D and 3D
• Torsional stress and deformation in shafts
• Statically indeterminate shafts
• Centroids and moments of inertia
• Bending stress in beams
• Direct shear stress in beams
• Shear and bending moment diagrams
• Composite beam analysis
• Beam deflections – singularity functions and superposition methods
• Statically indeterminate beams
• Multiaxial stress states and generalized Hooke’s law
• Principal stresses and maximum shearing stress
• Mohr’s circle for stress transformation
• Combined loading problems – 2D and 3D
• Euler buckling of columns

Class/Laboratory Schedule

• Two 50-minute lecture sessions per week
• One 110-minute recitation session per week
• Two in-class examinations plus a final exam

Design Component

The project consists of completing a design and analysis of an engineering structure. Examples of past projects include: overhead bridge crane, track construction crane, and truss bridge. Students work in teams of 4 or 5 to complete the assignment. Note that this project consists of design and analysis only. The deliverable is a design report consisting of analyses of the structural members, technical drawings, and an explanation of design decisions.

Contribution to professional component

• Math and basic science 1.0 (units)
• Engineering topics 2.0 (units)
• Does this course contain design experience? Yes

Relationship to program outcomes

ENES 220 contributes directly to the following specific Mechanical Engineering Program Outcomes of the ME Department:

1. 1. A knowledge of mathematics, physical science, and engineering science.

2. The ability to apply mathematics, science, and engineering knowledge to solve mechanical engineering problems.

3. The ability to use state-of-the-art engineering software, computers, and instrumentation as tools to solve engineering problems.

4. The ability to work in teams effectively to address practical engineering problems.

Prepared by: Robert Bonenberger
Date: February 8, 2005

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