曲げ試験における強度評価の品質工学的検討

抄録

In　the　strength　test　of　polymer　materials　by　the　flexual　test,　evaluation　was made　using　the　SN ratio　with　load　andspecimen　thickness　as　the　input　signals.　Traditionally,　the　quality　of　such　materials　kes　been　evaluated　mast　of　the　time　by　the　strength　at　break.　ln　this　study,　SN　ratios　were odtained　from　the　load/displacement,　curves　after　defining　the　elastic　and　plastic　deformation　domiains.　The　optimum　conditions　were　obtained　from　a　molding　experiment　using　molding　conditions　as　control　factors.　lt　was　clarified　that　the　results　of　verificaton　experiments　varied　depending on　how　the　SN　ratio　was　obtained.　Based　on　the　abobe　result,　conclusion　was　made　that　it　is　quite adequate　to　use　the　SN　ratios　from　the　load/displacement　curves　which　is　proposed　by　quality　engineering.