Damage tolerance of adhesively bonded structures. PhD Candidate: John-Alan Pascoe Department : ASM Section: Structural Integrity & Composites Supervisor : Dr. ir. R.C. Alderliesten Promoter: Prof. dr. ir. R. Benedictus Start date: 01-10-2012 Funding: NWO - Mosaic. Theory

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Stress and Strain. Solid Deformation. Solids deform when they are subject to forces. Compressed, stretched, bent, twisted They can maintain or lose their shape. The ratio of the force to the displacement is a constant. Hooke’s Law. F. D x. Stress. A force on a solid acts on an area.

Stress and Strain. Lab 4. To understand how engineers compare different materials. To understand how a strain gage works. To collect and analyze experimental data. Objectives. Strain: . Stress:. Hooke’s law:. Where: E = Modulus of Elasticity s = stress e = strain.

Stress/Strain Measurement. OPTI421/521L. Materials. Aluminum beam (1ea) Milling machine clamp (1set) Ruler and/or Vernier calipers (1ea) Strain gage (4ea) Resistance (4ea) Bread board (1 ea ) Power supply (1ea) Digital volt meter (1ea) Loctite (1ea) Lead wires (1set)

Stress and Strain. Stress. Force/Area Pressure is one form of Stress Units: Pascals (1 bar = 1 atm = 100,000 Pa) Normal Stress: Perpendicular to surface Compression vs. Tension Shear: Parallel to Surface. Stress. Hydrostatic Stress (usually compressional) Uniform in all directions.

Stress-Strain Relationships. Stress is a measure of the force per unit area Strain is a measure of the unit change in length ( uniaxial stress) or angle (shear) Elastic deformation relates the stress to strain through the proportionality constant of the elastic modulus, E

Stress and Strain. Deforming Solids. Solids deform when they are subject to forces. Compressed, stretched, bent, twisted They can maintain or lose their shape. Linearly Elastic. For small deformations, solids follow Hooke’s law.

Stress & Strain. Structural geology & Plate tectonics. Stress & Strain. Applied force & deformation. Increasing strain with increasing stress. Rock deformation. Key factors: Composition Temperature Stress duration Stress rate. Plate choctonics. Joints (tectonic).

Stress and strain. Strain. Both the stress and the strain tensor are symmetric. Stress and strain (again). Both the stress and the strain tensor are symmetric. Elastic Constants. Symmetry:. Thermodynamics:. Lame’s parameters. Lame’s parameters. Stress and Strain. Stress and Strain.

Stress and Strain. Lab 4. To understand how engineers compare different materials. To understand how a strain gage works. To understand important issues for data acquisition. To understand the need for experimental data. To understand some basic structural features of a bicycle.