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Low-Cycle Mechanical Fatigue Endurance of Various Joint Configurations

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Low-cycle fatigue endurance of Fiber-Reinforced Thermosetting-Resin Pipe (RTRP) spools with adhesive-bonded Taper joint, overwrapped adhesive bonded Taper joint, and Butt & Wrap joint was evaluated in accordance with Section X4.3.3 under Appendix X4 in ASTM F1173.

Product Number: 51317--9181-SG
ISBN: 9181 2017 CP
Author: Qizhong Sheng
Publication Date: 2017
Industry: Science of Corrosion
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A marine structure is often subjected to stress cycles of such large magnitude that small and significant parts of the structural component experience cyclic plasticity (low cycle fatigue). Welded joints are typically vulnerable to such low cycle fatigue. The same concern is also applicable to the joints in Glass-Fiber-Reinforced Thermosetting-Resin Pipe (RTRP) system installed in a marine structure as a corrosion-proof alternative to metallic piping systems. It is therefore the objective of this paper to present a preliminary evaluation of various bonded joints in RTRP system under low cycle fatigue loading.Low-cycle fatigue endurance of RTRP spools with adhesive-bonded Taper joint overwrapped adhesive-bonded Taper joint and Butt & Wrap joint was evaluated in accordance with Section X4.3.3 under Appendix X4 in ASTM F1173. Test results indicated satisfactory fatigue endurance of RTRP-11 (Type 1; Grade 1) test spools with adhesive-bonded Taper joint with or without overwrap under low-cycle mechanical fatigue loading. The adhesive-bonded Taper joint exhibited superior performance to the Butt & Wrap joint installed on RTRP-12 (Type 1; Grade 2) test spools which were not tough enough to sustain the high strain loading typically encountered in a marine structure. This paper describes the test and presents the findings.

Key words: adhesive-bond joint, butt & wrap, cyclic plasticity, low-cycle fatigue, mechanical fatigue, RTRP, Taper joint

A marine structure is often subjected to stress cycles of such large magnitude that small and significant parts of the structural component experience cyclic plasticity (low cycle fatigue). Welded joints are typically vulnerable to such low cycle fatigue. The same concern is also applicable to the joints in Glass-Fiber-Reinforced Thermosetting-Resin Pipe (RTRP) system installed in a marine structure as a corrosion-proof alternative to metallic piping systems. It is therefore the objective of this paper to present a preliminary evaluation of various bonded joints in RTRP system under low cycle fatigue loading.Low-cycle fatigue endurance of RTRP spools with adhesive-bonded Taper joint overwrapped adhesive-bonded Taper joint and Butt & Wrap joint was evaluated in accordance with Section X4.3.3 under Appendix X4 in ASTM F1173. Test results indicated satisfactory fatigue endurance of RTRP-11 (Type 1; Grade 1) test spools with adhesive-bonded Taper joint with or without overwrap under low-cycle mechanical fatigue loading. The adhesive-bonded Taper joint exhibited superior performance to the Butt & Wrap joint installed on RTRP-12 (Type 1; Grade 2) test spools which were not tough enough to sustain the high strain loading typically encountered in a marine structure. This paper describes the test and presents the findings.

Key words: adhesive-bond joint, butt & wrap, cyclic plasticity, low-cycle fatigue, mechanical fatigue, RTRP, Taper joint

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