©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
BME 231 Exam 3 Questions With Correct
Answers
Deformations - answer✔change in geometry under a given load
what deformation depends on - answer✔magnitude and direction of load and geometry and
material properties
deformable bodies - answer✔bodies which do not obey the rigid body assumption; two points
CAN move relative to one another under a given load
four main loads - answer✔compression, tension, shear, and torsion
tension external forces - answer✔equal and opposite, pointing outwards
tension internal forces - answer✔equal and opposite pointing inwards
tension deformation - answer✔lengthening/stretching and necking
examples of tension - answer✔tendons, ligaments, and muscles
compression external forces - answer✔equal and opposite and inwards
compression deformation - answer✔shortening and bulging outwards
1|Page
, ©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
compression examples - answer✔spinal discs
shear external forces - answer✔equal and opposite and along plane, but offset
shear internal forces - answer✔parallel but opposite
shear deformation - answer✔angular change (angle deflected from original application)
shear examples - answer✔bones and skin sometimes; both not always pure shear
torsion external forces - answer✔opposing force-couples (twisting torque)
torsion internal forces - answer✔opposite and in plane from what we see externally
torsion deformation - answer✔angular change
torsion examples - answer✔bone and spine
stress - answer✔how we normalize force (includes both normal and shear)
strain - answer✔how we normalize deformation; unitless
what force-displacement graph depends on - answer✔length and cross sectional area
issue with length and CSA dependency in force-displacement graph - answer✔geometry
restriction; can't compare between materials or materials under different conditions
yield stress - answer✔stress beyond which there is a substantial change in strain per stress;
0.2% offset
2|Page
ALL RIGHTS RESERVED.
BME 231 Exam 3 Questions With Correct
Answers
Deformations - answer✔change in geometry under a given load
what deformation depends on - answer✔magnitude and direction of load and geometry and
material properties
deformable bodies - answer✔bodies which do not obey the rigid body assumption; two points
CAN move relative to one another under a given load
four main loads - answer✔compression, tension, shear, and torsion
tension external forces - answer✔equal and opposite, pointing outwards
tension internal forces - answer✔equal and opposite pointing inwards
tension deformation - answer✔lengthening/stretching and necking
examples of tension - answer✔tendons, ligaments, and muscles
compression external forces - answer✔equal and opposite and inwards
compression deformation - answer✔shortening and bulging outwards
1|Page
, ©BRAINBARTER EXAM SOLUTIONS 2024/2025
ALL RIGHTS RESERVED.
compression examples - answer✔spinal discs
shear external forces - answer✔equal and opposite and along plane, but offset
shear internal forces - answer✔parallel but opposite
shear deformation - answer✔angular change (angle deflected from original application)
shear examples - answer✔bones and skin sometimes; both not always pure shear
torsion external forces - answer✔opposing force-couples (twisting torque)
torsion internal forces - answer✔opposite and in plane from what we see externally
torsion deformation - answer✔angular change
torsion examples - answer✔bone and spine
stress - answer✔how we normalize force (includes both normal and shear)
strain - answer✔how we normalize deformation; unitless
what force-displacement graph depends on - answer✔length and cross sectional area
issue with length and CSA dependency in force-displacement graph - answer✔geometry
restriction; can't compare between materials or materials under different conditions
yield stress - answer✔stress beyond which there is a substantial change in strain per stress;
0.2% offset
2|Page
