Nondestructive Computed Tomography Volumetric Void Acceptance Criteria for Heavy Polymer Sections
Computed tomography volumetric void acceptance requires zoning heavy polymer walls by stress field, setting pore limits below 0.1% in tensile skins.
ASTM E1570
Meaning
Standardized practices for computed tomography examination quantify volumetric internal features across industrial structures through recorded X-ray attenuation profiles. Procedures outlined in astm e1570 control scan geometry, beam quality, and image reconstruction parameters for non-destructive evaluation of moulded components. The practice governs detector exposure levels, voxel size uniformity, and defect size estimation limits within polymer matrix structures.
Its provisions stop at X-ray computed tomography, excluding ultrasonic examination, optical coordinate measurement, and destructive mechanical testing.
Computed Practice
Procedural requirements outlined in technical guidelines establish standardized workflows for inspecting complex polymeric assemblies. Adopting astm e1570 ensures consistent grey-scale calibration between virgin resin regions and fiber-reinforced sub-assemblies.
Radiographic Boundary
High-attenuation metal fasteners embedded in polybutylene terephthalate housings induce streak artifacts across adjacent plastic zones during scan processing. Procedures in astm e1570 specify filtering techniques and beam attenuation controls to preserve edge sharpness near material boundaries. Accurate voxel evaluation depends on maintaining uniform exposure times across the full 360-degree rotation of the sample stage.
Unfiltered radiation spectrums degrade contrast resolution, rendering small shrinkage voids invisible near dense metallic inserts.
Detector Sensitivity
Uncalibrated X-ray detectors drift over operational hours and reduce signal fidelity across low-density thermoplastic sections. Implementing astm e1570 diagnostic routines verifies pixel responsiveness and protects quality records against phantom density shifts during high-volume production runs.