Thermal Expansion Effects on Silicon Substrate Inertial Sensor Drift
Silicon substrate expansion mismatches create stress across MEMS structures, driving zero-g drift that demands isolated anchors and hysteresis modeling.
Localized Strain
Physical Deformation
Deformation density defines the localized strain occurring within a discrete volume of a material under mechanical load. This localized strain identifies the ratio of displacement change over an initial gauge length at a specific point rather than across the entire geometry. Material science standards use this measurement to isolate zones where structural integrity risks exceed base expectations.
Stress Concentration
Geometric discontinuities force force lines to bunch in confined regions. Localized strain rises sharply around sharp notches or internal voids as the crystal structure yields to accommodate the energy flux. Elastic limits remain constant for the bulk component while these hot spots transition into plastic flow.
Calibration Metric
Digital image correlation systems calculate localized strain through the observation of surface markers during tensile testing. Resolution depends on the density of the pattern applied to the specimen surface and the tracking accuracy of the optical sensors. Measurement drift occurs when camera vibration or thermal expansion of the target fixture introduces artificial displacement.
Engineering Limit
Yield criteria determine the point where localized strain results in permanent structural failure. Designers set safety margins against these predictions to prevent crack propagation in pressure vessels or load-bearing frames. Failure occurs when the accumulation of these displacements crosses the threshold of material fracture.