ME 354 Mechanics of Materials Lab Lecture 1

ME 354 Mechanics of Materials Lab Lecture 1 Overview Jiangyu Li University of Washington Jiangyu Li, University of Washington

Instructor and TAs Instructor: – Prof. Jiangyu Li – jjli@u. washington. edu – (Tentative) Office hours: MW, 10: 30 -11: 30 AM, MEB 207 TAs: • Mark Miller, mjm 47@u. washington. edu • Peiqi Wang, wangpq@uw. edu (Tentative) Office hour: Friday, 3: 30 -4: 30 PM, MEB 236 Jiangyu Li, University of Washington

Course Organization Textbook: Norman E. Dowling, Mechanical Behavior of Materials - Engineering Methods for Deformation, Fracture, and Fatigue, 2 nd Custom Edition for the University of Washington, Pearson Custom Publish, Pearson References: 1. James M. Gere, Mechanics of Materials, Brooks/Cole (CEE 220) 2. Joseph E. Shigley, Charles R. Mischke, and Richard G. Budynas, Mechanical Engineering Design, Mc. Graw Hill (ME 356) Website: https: //catalyst. uw. edu/workspace/wangpq/32217/216908 Jiangyu Li, University of Washington

Schedule LECTURES Monday, Tuesday, Wednesday: 9: 30 ~ 10: 20 am RECITATIONS and LAB PREPREATION (by TA) Friday: 9: 30 ~ 10: 20 am LABS (MEB 127) (AA) Monday: 2: 30 – 5: 20 pm (AB) Wednesday: 2: 30 – 5: 20 pm (AC) Thursday: 2: 30 – 5: 20 pm Jiangyu Li, University of Washington

Grading Policy (1) • Homework • Lab reports X 6 – Formal Report X 2 – Memo / Short Report X 4 • Exam X 2 25% 40% 20% 30% - No Final Exam • Quiz • Bonus 5% 2% Jiangyu Li, University of Washington

Grading Policy (2) • HOMEWORKS: – due before 12: 00 pm (NOON) on every Monday at the Mechanical Engineering Office. Unless arranged in advance, late homework will not be accepted. • LAB REPORTS: 1. Short report (Memo) are due at the beginning of the lab one week after the assignment; 2. Formal report is due two weeks after assignment • MID-TERM EXAMS (No FINAL EXAM) – 2 midterm exams to be announced one week before exam date – Only under proven extraordinary circumstances will the makeup exam be given. Jiangyu Li, University of Washington

Academic Accommodation If you would like to request academic accommodations due to a disability, please contact Disabled Student Services, 448 Schmitz Hall, (206) 5438924 (V/TDD). Jiangyu Li, University of Washington

Academic Dishonest Cheating on exams and plagiarism in the preparation of homework are unacceptable. Academic sanctions will be taken against all parties involved in the act of cheating and/or plagiarism. Jiangyu Li, University of Washington

Classroom Conduct Please be considerate of the learning mission of the class and refrain from activity that is disruptive Jiangyu Li, University of Washington

Lecture Topics 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Beam, Energy method and unsymmetrical beam Buckling Stresses and strains, Mohr’s circle Elasticity failure Plasticity Torsion Fracture Impact Creep and fatigue Jiangyu Li, University of Washington

Lab Topics • • • Beam (Wang) (Memo) Buckling (Miller) (Memo) Tension (Wang) (FOMRAL REPORT) Torsion (Miller) (FORMAL REPORT) Fracture (Miller) (Memo) Nanoidentation (Wang, MEB B 012) (Memo) Memo report is due 1 week from the date of experiment. Long report is due 2 weeks from the date of experiment. 5 pm, ME Main office or TA during Lab sessions! Jiangyu Li, University of Washington

Assignment • Review Mechanics of Materials (CEE 220) • Read Note on Strain Gage • Read Note on Lab 1 • Homework # 1 will be uploaded on Tuesday and is due on Monday! Jiangyu Li, University of Washington

3 modes of deformations

Formulation in Mechanics

Beam bridge Probe Cantilever beam + Tip Jiangyu Li, University of Washington

Beam Jiangyu Li, University of Washington

Types of Supports Beam supported on a wall Beam-to-column connection Pole anchored to a concrete pier Jiangyu Li, University of Washington

Types of Beams Jiangyu Li, University of Washington

Sign Convention

Shear Force & Bending Moment Diagrams

Shear Force & Bending Moment Diagrams Example: Jiangyu Li, University of Washington

Shear Force & Bending Moment Diagrams Jiangyu Li, University of Washington

What can we get from V(x) and M(x) ? • Deflection, slope, curvature • Normal and Shear Stress over cross section Jiangyu Li, University of Washington

A. Deflection of Beam Jiangyu Li, University of Washington

A. Deflection of Beam Jiangyu Li, University of Washington

A. Deflection of Beam

Boundary conditions ~ geometry Jiangyu Li, University of Washington

Continuity Conditions Jiangyu Li, University of Washington

Deflection by Bending Moment Equation Jiangyu Li, University of Washington

Deflection by Loading Equation Jiangyu Li, University of Washington

Deflection by Superposition Jiangyu Li, University of Washington

What can we get from V(x) and M(x) ? • Stresses and strains Jiangyu Li, University of Washington

Normal Stress Equilibrium Go through centroid ! Jiangyu Li, University of Washington

Normal stresses Jiangyu Li, University of Washington

Jiangyu Li, University of Washington

Shear Stress Jiangyu Li, University of Washington

Shear Stress Jiangyu Li, University of Washington

Distribution of Shear Stress Jiangyu Li, University of Washington

Shear Stress in special cross sections Jiangyu Li, University of Washington

Shear Stress in I-Beam Jiangyu Li, University of Washington

Big Picture Jiangyu Li, University of Washington

Next ? • Energy method for beam deflection • Unsymmetrical beams • Curved beams Jiangyu Li, University of Washington