Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading
A zirconium alloy cylindrical tube exhibited fracture under high-velocity axial impact load when high yield strength pellets were inserted as reported by Morishige et al., 2016. The fracture occurred after a crack was initiated at the tensile side of the bending tube. In this paper, FE analyses were...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | Japanese |
| Published: |
The Japan Society of Mechanical Engineers
2017-11-01
|
| Series: | Nihon Kikai Gakkai ronbunshu |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00304/_pdf/-char/en |
| _version_ | 1811221175012950016 |
|---|---|
| author | Naoki MORISHIGE Farid TRIAWAN Kazuaki INABA Kikuo KISHIMOTO |
| author_facet | Naoki MORISHIGE Farid TRIAWAN Kazuaki INABA Kikuo KISHIMOTO |
| author_sort | Naoki MORISHIGE |
| collection | DOAJ |
| description | A zirconium alloy cylindrical tube exhibited fracture under high-velocity axial impact load when high yield strength pellets were inserted as reported by Morishige et al., 2016. The fracture occurred after a crack was initiated at the tensile side of the bending tube. In this paper, FE analyses were conducted to clarify the fracture mechanism as well as the deformation behavior. At first, axial tensile tests using tubes with four slit-holes located at the center were performed in order to evaluate the fracture behavior of the tube. Then, digital image correlation (DIC) method was utilized to measure the local strain near the slit-holes. The results showed that the fracture displacement became smaller with smaller slit-holes’ radius. Also, the strain was concentrated at the slit-holes’ tips where cracks were generated before fracture. Subsequently, FE analyses of the tensile tests were conducted by LS-DYNA using the implicit method to obtain the fracture criterion. The load-displacement curve agreed well with the experiment. Then, the relationship between stress triaxiality and equivalent plastic strain near the slit-holes’ area were evaluated to define the fracture criterion. Finally, FE analyses of the axial impact tests using the dynamic explicit method were conducted to compare with the fracture criterion defined by the axial tensile tests. The results indicated that a localized stress and strain might occur at the tube boundary adjacent to pellets. This was caused by the interaction between tube and pellets’ edge which generated a tensile stress condition at the tube boundary when high yield strength pellet was applied. Under this condition, both stress triaxiality and effective plastic strain could increase and eventually lead to the fracture criterion. |
| first_indexed | 2024-04-12T07:53:32Z |
| format | Article |
| id | doaj.art-a846cdcbeb11478b84e345c28e36e1de |
| institution | Directory Open Access Journal |
| issn | 2187-9761 |
| language | Japanese |
| last_indexed | 2024-04-12T07:53:32Z |
| publishDate | 2017-11-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Nihon Kikai Gakkai ronbunshu |
| spelling | doaj.art-a846cdcbeb11478b84e345c28e36e1de2022-12-22T03:41:32ZjpnThe Japan Society of Mechanical EngineersNihon Kikai Gakkai ronbunshu2187-97612017-11-018385517-0030417-0030410.1299/transjsme.17-00304transjsmeFracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loadingNaoki MORISHIGE0Farid TRIAWAN1Kazuaki INABA2Kikuo KISHIMOTO3Department of Mechanical Sciences and Engineering, Tokyo Institute of TechnologySchool of Environment and Society, Department of Transdisciplinary Science and Engineering, Tokyo Institute of TechnologySchool of Environment and Society, Department of Transdisciplinary Science and Engineering, Tokyo Institute of TechnologySchool of Environment and Society, Department of Transdisciplinary Science and Engineering, Tokyo Institute of TechnologyA zirconium alloy cylindrical tube exhibited fracture under high-velocity axial impact load when high yield strength pellets were inserted as reported by Morishige et al., 2016. The fracture occurred after a crack was initiated at the tensile side of the bending tube. In this paper, FE analyses were conducted to clarify the fracture mechanism as well as the deformation behavior. At first, axial tensile tests using tubes with four slit-holes located at the center were performed in order to evaluate the fracture behavior of the tube. Then, digital image correlation (DIC) method was utilized to measure the local strain near the slit-holes. The results showed that the fracture displacement became smaller with smaller slit-holes’ radius. Also, the strain was concentrated at the slit-holes’ tips where cracks were generated before fracture. Subsequently, FE analyses of the tensile tests were conducted by LS-DYNA using the implicit method to obtain the fracture criterion. The load-displacement curve agreed well with the experiment. Then, the relationship between stress triaxiality and equivalent plastic strain near the slit-holes’ area were evaluated to define the fracture criterion. Finally, FE analyses of the axial impact tests using the dynamic explicit method were conducted to compare with the fracture criterion defined by the axial tensile tests. The results indicated that a localized stress and strain might occur at the tube boundary adjacent to pellets. This was caused by the interaction between tube and pellets’ edge which generated a tensile stress condition at the tube boundary when high yield strength pellet was applied. Under this condition, both stress triaxiality and effective plastic strain could increase and eventually lead to the fracture criterion.https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00304/_pdf/-char/encylindrical tubespelletsaxial impact loadfracturetensile testdigital image correlationstress triaxialityfinite element analysis |
| spellingShingle | Naoki MORISHIGE Farid TRIAWAN Kazuaki INABA Kikuo KISHIMOTO Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading Nihon Kikai Gakkai ronbunshu cylindrical tubes pellets axial impact load fracture tensile test digital image correlation stress triaxiality finite element analysis |
| title | Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| title_full | Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| title_fullStr | Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| title_full_unstemmed | Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| title_short | Fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| title_sort | fracture behaviour of zirconium alloy cylindrical tube with pellets under axial impact loading |
| topic | cylindrical tubes pellets axial impact load fracture tensile test digital image correlation stress triaxiality finite element analysis |
| url | https://www.jstage.jst.go.jp/article/transjsme/83/855/83_17-00304/_pdf/-char/en |
| work_keys_str_mv | AT naokimorishige fracturebehaviourofzirconiumalloycylindricaltubewithpelletsunderaxialimpactloading AT faridtriawan fracturebehaviourofzirconiumalloycylindricaltubewithpelletsunderaxialimpactloading AT kazuakiinaba fracturebehaviourofzirconiumalloycylindricaltubewithpelletsunderaxialimpactloading AT kikuokishimoto fracturebehaviourofzirconiumalloycylindricaltubewithpelletsunderaxialimpactloading |