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Penflex Test Report: U-Bend Fatigue TestU-BEND FATIGUE TESTPENFLEX TEST SUMMARY REPORTReport Date: 5/9/2019Page 1 of 11
Penflex Test Report: U-Bend Fatigue TestTABLE OF CONTENTSINTRODUCTION. 31.1Purpose . 31.2Description of Samples . 31.3Test parameters. 31.4Requirments. 3TEST SUMMARY . 42.1Results . 42.2Failiure Mode . 42.3Examination. 5APPENDIX A - ISO 10380:2012(E) .5APPENDIX B - PENFLEX U-BEND TEST PROCEDURE .10APPENDIX C - PICTURE OF PENFLEX U-BEND TESTER .11Page 2 of 11
Penflex Test Report: U-Bend Fatigue TestINTRODUCTION1.1PURPOSEConduct a U-Bend Test to compare the cycle life of single-braided annular and helical hoseusing ISO standards 10380:2012(E).1.2DESCRIPTION OF SAMPLESThree stainless steel, single braided, annular hoses and three stainless steel, single braided,helical hoses (Table 1):QuantityHose ID(in)Length(ft)CorrugationTypePenflex Sample -012Table 11.3TEST PARAMETERSU-Bend Test per ISO 10380:2012(E) Section 5.7 (See Appendix A). Penflex procedure includedin Appendix B. Test parameters for each assembly (Table 2):PenflexTestPressureSample ID Pressure Medium(PSI)Dynamic Rfor U-BendTesting(mm)- 103802012-type 150Dynamic R Cycles/minutefor U-BendTesting(in)- 103802012-type Water2038.019Table 21.4REQUIRMENTSNo pressure drop in hose assembly or localized reduction of the hose radius more than 50%during the test.Page 3 of 11
Penflex Test Report: U-Bend Fatigue TestTEST SUMMARY2.1RESULTSThe results of the cycle testing are summarized in Table 3:Sample icalAnnularCyclesTerminationCause25,782Pressure Drop33,730Pressure Drop34,837Pressure Drop235,991Pressure Drop316,721Pressure Drop343,738Pressure DropTable 32.2FAILIURE MODEFigure 1: Annular hose at 115,000 cyclesPage 4 of 11Figure 2: Helical hose at 20,000 cycles
Penflex Test Report: U-Bend Fatigue Test2.3EXAMINATIONFigures 1 and 2 show the leak location for two test-samples. For helical hose, the cause of failureappears to be a stress fracture. For annular hose, the rubbing between the hose and braid slowlynotched a hole into the surface.Figure 4: Crack in Helical HoseFigure 3: Crack in Annular HosePage 5 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix A - ISO 10380:2012(E)Page 6 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix A (Continued)Page 7 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix A (Continued)Page 8 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix A (Continued)Page 9 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix B - Penflex U-Bend Test ProcedurePage 10 of 11
Penflex Test Report: U-Bend Fatigue TestAppendix C - Picture of Penflex U-Bend TesterPage 11 of 11
Penflex Test Report: U-Bend Fatigue Test Page 5 of 11 2.3 EXAMINATION Figures 1 and 2 show the leak location for two test-samples. For helical hose, the cause of failure appears to be a stress fracture. For annular hose, the rubbing between the hose and braid slowly notched a hole into the surface. Figure 3: Crack in Annular Hose
