Mech Mat Sci
Rishi Raj
rishi.raj@colorado.edu 

(updated Spring 2021)











Jan 20: DNA Molecule

Stiffness of One Unit in DNA

Full Publication from which above is extracted


Jan 24: Youngs Modulus and Density Map

The Elastic Modulus and Density Map


Jan 27: Problems Related to the Periodic Table, the orbitals and electronegativity

HW 03 for Jan 27 class


Feb 06: Problems Related to Elastic Modulus and Bond Energy

HW 04 Modulus and Bond Energy


Feb 15: Problems Related to the Elastic Constants

HW 05 on Elastic Constants


Feb 22: Problems Related to Principal Stresses and Strains

HW 06 Principal Stresses and Strains


Problems Related to Elastic Properties of Composites

HW 07 Composites


Take Home Exam 1: Elastic Deformation

Take Home Exam HW-09: Assigned Mar 01 due by email on or before Mar 15


Solutions to the first Take Home Exam


Problem Related to Slip Plane and Slip Direction

HW 08 Critial Resolved Shear Stress in the Slip Plane and the Slip Direction


Problem Related to the shape of the shear displacement curve

HW 09: Sinusoidal Shape for Ideal Yield Stress Analysis


Problems Related to the Crystallography of Slip Systems

HW 10: Multiplicity of the Most Favored Slip Systems


Problems Related to the Force on a Dislocation

HW 11/12: Force on a meandering dislocation lying in the slip plane


Problem Related to the Curvature on a Dislocation Segment

HW 13: The Radius of Curvature in a Dislocation Segment under Applied Shear Stress


Take Home Exam II: Plastic Deformation

Take Home Exam II: Assigned Mar 23 due April 05


Solutions to Take Home Exam on Plasticity


Problem Related to the Measurement of the Fracture Energy from the Change in Compliance with the flaw size in a specimen: the case of a double cantilever beam specimen

HW 15: Double Cantilever Beam Specimen for Fracture Measurement


Problem Related to Fracture Toughness as a Material Parameter

HW 16: Fracture Toughess, Work of Fracture and Stress Intensity Factor


Problem Related to Fracture Toughness of Glass seen from the events at the crack tip

HW 17: Fracture Toughess calculated from a displacement criterion near the crack tip


Problem Related to CTOD and the Plastic Zone Size

HW 18: Fracture Toughess calculated from CTOD and its Relationship to the Plastic Zone Size


Take Home Exam III: Fracture

HW 19 - Take Home Exam III: Assigned Wed Apr 14 due Fri April 23


HW 19 - Take Home Exam III: Solutions




Take Home Exam IV: High Temperatures

HW 21 - Take Home Exam IV High Temperature: Apr 28 due Fri May 07