Random non-proportional fatigue tests with planar tri-axial fatigue testing machine
Complex stresses, which occur on the mechanical surfaces of transport machinery in service, bring a drastic degradation in fatigue life. However, it is hard to reproduce such complex stress states for evaluating the fatigue life with conventional multiaxial fatigue machines. We have developed a fati...
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Gruppo Italiano Frattura
2016-10-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_35.pdf |
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| author | T. Inoue R. Nagao N. Takeda |
| author_facet | T. Inoue R. Nagao N. Takeda |
| author_sort | T. Inoue |
| collection | DOAJ |
| description | Complex stresses, which occur on the mechanical surfaces of transport machinery in service, bring a drastic degradation in fatigue life. However, it is hard to reproduce such complex stress states for evaluating the fatigue life with conventional multiaxial fatigue machines. We have developed a fatigue testing machine that enables reproduction of such complex stresses. The testing machine can reproduce arbitrary in-plane stress states by applying three independent loads to the test specimen using actuators which apply loads in the 0, 45, and 90 degree directions. The reproduction was tested with complex stress data obtained from the actual operation of transport machinery. As a result, it was found that the reproduced stress corresponded to the measured stress with an error range of less than 10 %. Then, we made a comparison between measured fatigue lives under random non-proportional loading conditions and predicted fatigue lives. It was found that predicted fatigue lives with cr, stress on critical plane, were over a factor of 10 against measured fatigue lives. On the other hand, predicted fatigue lives with ma, stress in consideration of a non-proportional level evaluated by using amplitude and direction of principal stress, were within a factor of 3 against measured fatigue lives |
| format | Article |
| id | doaj-art-0de240f2f48e4d45ae2e569031265cf5 |
| institution | Kabale University |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2016-10-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-0de240f2f48e4d45ae2e569031265cf52025-02-03T10:38:19ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932016-10-01103825926510.3221/IGF-ESIS.38.35Random non-proportional fatigue tests with planar tri-axial fatigue testing machineT. Inoue0R. Nagao1N. Takeda2Hitachi, Ltd.,JapanHitachi, Ltd.,JapanHitachi, Ltd.,JapanComplex stresses, which occur on the mechanical surfaces of transport machinery in service, bring a drastic degradation in fatigue life. However, it is hard to reproduce such complex stress states for evaluating the fatigue life with conventional multiaxial fatigue machines. We have developed a fatigue testing machine that enables reproduction of such complex stresses. The testing machine can reproduce arbitrary in-plane stress states by applying three independent loads to the test specimen using actuators which apply loads in the 0, 45, and 90 degree directions. The reproduction was tested with complex stress data obtained from the actual operation of transport machinery. As a result, it was found that the reproduced stress corresponded to the measured stress with an error range of less than 10 %. Then, we made a comparison between measured fatigue lives under random non-proportional loading conditions and predicted fatigue lives. It was found that predicted fatigue lives with cr, stress on critical plane, were over a factor of 10 against measured fatigue lives. On the other hand, predicted fatigue lives with ma, stress in consideration of a non-proportional level evaluated by using amplitude and direction of principal stress, were within a factor of 3 against measured fatigue liveshttp://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_35.pdfFatigueNon-proportionalRandomPlane stressFatigue life predictionTesting machine |
| spellingShingle | T. Inoue R. Nagao N. Takeda Random non-proportional fatigue tests with planar tri-axial fatigue testing machine Fracture and Structural Integrity Fatigue Non-proportional Random Plane stress Fatigue life prediction Testing machine |
| title | Random non-proportional fatigue tests with planar tri-axial fatigue testing machine |
| title_full | Random non-proportional fatigue tests with planar tri-axial fatigue testing machine |
| title_fullStr | Random non-proportional fatigue tests with planar tri-axial fatigue testing machine |
| title_full_unstemmed | Random non-proportional fatigue tests with planar tri-axial fatigue testing machine |
| title_short | Random non-proportional fatigue tests with planar tri-axial fatigue testing machine |
| title_sort | random non proportional fatigue tests with planar tri axial fatigue testing machine |
| topic | Fatigue Non-proportional Random Plane stress Fatigue life prediction Testing machine |
| url | http://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_35.pdf |
| work_keys_str_mv | AT tinoue randomnonproportionalfatiguetestswithplanartriaxialfatiguetestingmachine AT rnagao randomnonproportionalfatiguetestswithplanartriaxialfatiguetestingmachine AT ntakeda randomnonproportionalfatiguetestswithplanartriaxialfatiguetestingmachine |