(A 36 ASTM ) دراسة تأثیر الحركة الترددیة على معدل البلى الجاف و الرطب والبنیة المجهریة للفولاذ الإنشائي نوع
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(A 36) ASTMalloy, Based Iron, Carbon and Alloy Steel Mechanical PropertiesAbstract
ﯿﻬدف ﻫذا اﻟﺒﺤث اﻟﻰ دراﺴﺔ اﻟﺒﻠﯿﺎن اﻟﻨﺎﺘﺞ ﻤن ﺠﻬﺎز اﻟﺒﻠﯿﺎن اﻟﺘرددي واﻟﺒﻨﯿـﺔ اﻟﻤﺠﻬرﯿـﺔ ﻟﻌﯿﻨـﺎت ﻤـن اﻟﻔـوﻻذ اﻹﻨـﺸﺎﺌﻲ A 36 ASTM، ﺤﯿث ﺘم ﺘﺤﻀﯿر اﻟﻌﯿﻨـﺎت ﻤـن ﺨـﻼل اﻟﺘﻘطﯿـﻊ واﻟﺘﻨﻌـﯿم واﻟـﺼﻘل اﻟﻌﯿﻨـﺎت و إﺨـﻀﺎع اﻟﻌﯿﻨـﺎت اﻟـﻰ ﺠﻬـﺎز ﺒﻠــﻰ ذو ﺤرﻛــﺔ ﺘرددﯿــﺔ أﻓﻘﯿــﺔ ﺘــم ﺘــﺼﻤﯿﻤﻪ وﺘــﺼﻨﯿﻌﻪ ﻤﺤﻠﯿــﺎ"ﻟﻬــذا اﻟﻐــرض. وﯿــﺘم أﺴــﺘﺨدام ﻫــذا اﻟﺠﻬــﺎز ﻓــﻲ ﺤــﺎﻟﺘﯿن اﻷوﻟــﻰ ﺒوﻀـﻊ اﻟﻌﯿﻨـﺎت ﺘﺤـت ﺘـﺄﺜﯿر اﻟﺠﻬــﺎز ﺒـدون ﻤـؤﺜر آﺨـر أي ﺒﻠــﻰ ﺠـﺎف، واﻟﺜﺎﻨﯿـﺔ ﺒوﻀـﻊ اﻟﻌﯿﻨـﺎت ﻓــﻲ وﺴـط أﻛـﺎل ﻤﻛـون ﻤــن ﻤــﺎء اﻟﺒﺤــر وﺘﺤــت ﺘــﺄﺜﯿر إﺠﻬــﺎد اﻟﺒﻠــﻰ اﻟﺘــرددي أي اﻟﺒﻠــﻰ اﻟرطــب، وﺘــم ﺒﻌــد ذﻟــك دراﺴــﺔ اﻟﻔــرق ﺒــﯿن اﻟﺤــﺎﻟﺘﯿن وﺒﯿــﺎن ﺴــﺒب ﺤــدوث اﻻﺨــﺘﻼف ﺒــﯿن اﻟوﻀــﻌﯿن. وﺘﺒــﯿن أﻨــﻪ ﯿــزداد ﻨﻘــﺼﺎن اﻟــوزن وﻤﻌــدل اﻟﺒﻠــﻰ ﻓــﻲ ﻛــﻼ اﻟﺤــﺎﻟﺘﯿن ﻨﺘﯿﺠــﺔ اﻟــﺴﺤق أﺜﻨــﺎء اﻻﺤﺘﻛﺎك وﺘﻛﺴر اﻟرواﺒط اﻟﺒﻠورﯿﺔ ﺒﯿن اﻟﻛﺎرﺒﯿدات اﻟـﻀﻌﯿﻔﺔ و اﻟﻤﺘﻛوﻨـﺔ ﻨﺘﯿﺠـﺔ اﻟﺤـرارة اﻟﻤﺘوﻟـدة أﺜﻨـﺎء اﻟﺒﻠـﻰ وﻫـذا ﻤـﺎ أﺘـﻀﺢ ﻓﻲ ﺼور اﻟﺒﻨﻰ اﻟﻤﺠﻬرﯿﺔ ، وﻟﻛن ﺘﻛون زﯿﺎدة ﻨﻘـﺼﺎن اﻟـوزن ﻤـﻊ اﻟﺒﻠـﻰ اﻟرطـب أﻛﺜـر ﺒـﺴﺒب وﺠـود ﻋﺎﻤـل أﺨـر ﻤـؤﺜر ﻋﻠـﻰ ﺼﺎن اﻟوزن وﻤﻌدل اﻟﺒﻠﻰ وﻫو اﻟﺘﺂﻛل أﻹﺠﻬﺎدي ﻓﻲ اﻟوﺴط اﻷﻛﺎل واﻟذي ﯿزداد ﻤﻊ زﯿﺎدة أﺠﻬﺎد اﻟﺒﻠﻰ
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