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Endurance Regression Testing: A Method to Replace ASTM D2992

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After decades of use, it is becoming evident that the standard practice ASTM D2992 and referenced Standard test Method ASTM D1598 may not be producing the intended results.

Product Number: 51317--9208-SG
ISBN: 9208 2017 CP
Author: David Granderson
Publication Date: 2017
Industry: Test Method
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After decades of use it is becoming evident that the standard practice ASTM D2992 and referenced Standard test Method ASTM D1598 may not be producing the intended results. Like the current ASTM practices the goal of “Endurance Regression testing” is to obtain the Hydrostatic Design Basis for “Fiberglass” (Glass Reinforced Thermosetting Resin Pipe Fittings and Joints). “Endurance Regression Testing” will similarly measure plot and extrapolate the long term hydrostatic strength (LTHS) of fiberglass components upon exposure to a controlled and constant set of aging condition. The constant aging condition is the primary departure from ASTM D2992 methods.The choice of long term aging conditions shall take into account that there exists critical thresholds that should not be exceeded if one plans to predict performance of a similarly undamaged fiberglass component. The tested components are intended to “Endure” a pre-determined maximum design condition intentionally set at levels believed to be below that of permanent damage. Essentially we will separate the regression testing into two stages: 1) aging or degrading the composite with temperature stress water and: 2) failure testing – measuring the effect of the constant aging conditions. We will determine a (HDB) and/or Pressure design base (PDB) and identify the component’s regression gradient for use in subsequent qualifications or QA testing of similar related components.

Key words:  ASTM D2992, ASTM D1598

After decades of use it is becoming evident that the standard practice ASTM D2992 and referenced Standard test Method ASTM D1598 may not be producing the intended results. Like the current ASTM practices the goal of “Endurance Regression testing” is to obtain the Hydrostatic Design Basis for “Fiberglass” (Glass Reinforced Thermosetting Resin Pipe Fittings and Joints). “Endurance Regression Testing” will similarly measure plot and extrapolate the long term hydrostatic strength (LTHS) of fiberglass components upon exposure to a controlled and constant set of aging condition. The constant aging condition is the primary departure from ASTM D2992 methods.The choice of long term aging conditions shall take into account that there exists critical thresholds that should not be exceeded if one plans to predict performance of a similarly undamaged fiberglass component. The tested components are intended to “Endure” a pre-determined maximum design condition intentionally set at levels believed to be below that of permanent damage. Essentially we will separate the regression testing into two stages: 1) aging or degrading the composite with temperature stress water and: 2) failure testing – measuring the effect of the constant aging conditions. We will determine a (HDB) and/or Pressure design base (PDB) and identify the component’s regression gradient for use in subsequent qualifications or QA testing of similar related components.

Key words:  ASTM D2992, ASTM D1598

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