Quantifying Microvia Target Pad Interfacial Shear Displacement under Thermal Shock
Microvia target pad interfacial shear displacement stems from CTE mismatch during thermal shock, demanding tight lamination control to prevent failure.
Digital Volume Correlation
Volumetric Measurement
Quantitative analysis of material deformation relies on the capture of three-dimensional displacement fields through the comparison of computed tomography scan pairs. Digital volume correlation tracks the movement of internal features or grayscale patterns within reconstructed scan data by identifying matching sub-volumes across states. This analytical technique operates on the premise that internal material textures remain spatially consistent despite mechanical or thermal loading.
High-resolution X-ray imaging provides the base data while algorithms map local vectors for every voxel coordinate. Reliability depends on the contrast quality of the object and the precision of the underlying scan acquisition.
Structural Deformation
Complex internal strain distributions appear after the subtraction of rigid body motion from the raw displacement data derived through digital volume correlation. Calculation of the displacement gradient tensor yields the strain tensor components at any interior point. Engineers use these data to identify localized void growth or fiber debonding within a composite laminate before external surfaces show visible damage.
Accuracy drops if the scan resolution fails to capture the spatial frequency of the material microstructure.
Assembly Verification
Computed tomography data integration verifies the integrity of solder joints or package interfaces by monitoring shift patterns during accelerated life testing. Small deviations in the internal morphology of a circuit indicate potential fatigue or delamination long before electrical failure occurs. Application of digital volume correlation to assembly inspection identifies hidden stress concentrations that arise from thermal mismatch between materials in a stacked semiconductor package.
Internal displacement tracking provides the primary metric for validating the structural robustness of high-density electronic assemblies.