تحديد وتحليل العلاقة بين الاجهاد وعدد الدو ا رت للفولاذ السبائكي المنخفض الكاربون تحت تأثير المعاملات السطحية المختلفة بأستخدام معامل الارتباط

Abstract

اﺴﺘﺨدام ﺘﺤﻠﯿل اﻻرﺘﺒﺎط Correlation Analysis ﻓﻲ ﺘﺤدﯿد ﻗوة وﻨوع ﻋﻼﻗﺔ اﻻرﺘﺒﺎط ﺒﯿن اﻻﺠﻬﺎد اﻟﻤﺴﻠط وﻋدد دورات اﻟﻛﻼل )Fatigue Cycles( ﻟﺤﯿن ﺤﺼول اﻟﻔﺸل )ﻛﺴر اﻟﻌﯿﻨﺔ( وﺼوﻻ اﻟﻰ ﺤد اﻟﻛﻼل )Fatigue Limit( ﻟﺴﺒﯿﻛﺔ اﻟﻔوﻻذ اﻟﻤﻨﺨﻔض اﻟﻛﺎرﺒون ﻟﻤﻌﺎﻤﻼت ﺴطﺤﯿﺔ ﻤﺨﺘﻠﻔﺔ وﻛذﻟك ﺘﺤدﯿد ﺘﺄﺜﯿر اﻟﻤﻌﺎﻤﻠﺔ اﻟﺴطﺤﯿﺔ ﻋﻠﻰ ﻫذة اﻟﻌﻼﻗﺔ. ﺘم اﺠراء اﺨﺘﺒﺎر اﻟﻛﻼل ﻋﻠﻰ أرﺒﻊ ﻤﺠﺎﻤﯿﻊ ﻤن اﻟﻌﯿﻨﺎت )A,B,C,D( ﺘﺘﻛون ﻛل ﻤﺠﻤوﻋﺔ ﻤن ﺴت ﻋﯿﻨﺎت اﺠري ﻟﻛل ﻤﺠﻤوﻋﺔ ﻤﻌﺎﻤﻠﺔ ﺴطﺤﯿﺔ ﻤﺨﺘﻠﻔﺔ )(Surface Treatment ﻫﻲ ﻋﻠﻰ اﻟﺘواﻟﻲ: ﻤﺠﻤوﻋﺔ )A( ﺒدون ﻤﻌﺎﻤﻠﺔ ﺤرارﯿﺔ ) As Received(، ﻤﺠﻤوﻋﺔ )B( اﻟﻘذف ﺒﺎﻟﻛرات) Shot Penning(، ﻤﺠﻤوﻋﺔ )C( اﻟﻨﺘردة )Nitriding(، ﻤﺠﻤوﻋﺔ )D( اﻟﻨﺘردة واﻟﻘذف ﺒﺎﻟﻛرات )Shot Penning & Nitriding(. ﺘم اﺴﺘﺨدام اﻟﺒرﻨﺎﻤﺞ اﻟﺤﺎﺴوﺒﻲ Win QSB ﻓﻲ ﺘﺤدﯿد ﻤﻘدارﻗوة وﻨوع اﻻرﺘﺒﺎط ﺒﯿن اﻻﺠﻬﺎد اﻟﻤﺴﻠط وﻋدد دورات اﻟﻛﻼل ﻟﺤﯿن ﺤﺼول اﻟﻔﺸل ﺤﯿث وﺠد ان ﻫﻨﺎك ﻋﻼﻗﺔ ﺴﺎﻟﺒﺔ ﻗوة اﻟﻌﻼﻗﺔ ﺘﺨﺘﻠف ﺒﺎﺨﺘﻼف اﻟﻤﻌﺎﻤﻠﺔ اﻟﺴطﺤﯿﺔ ﺒﯿن اﻻﺠﻬﺎد اﻟﻤﺴﻠط وﻋدد دورات اﻟﻛﻼل ﻟﻠﻤﺠﺎﻤﯿﻊ اﻻرﺒﻌﺔ وﻫﻲ ﻋﻠﻰ اﻟﺘواﻟﻲ: ﺴﺎﻟﺒﺔ ﻋﻛﺴﯿﺔ ﻗوﯿﺔ ﻤﻘدارﻫﺎ ) ٠,٨٩٣٤-( ﻓﻲ ﺤﺎﻟﺔ اﻟﻤﻌدن ﻏﯿر اﻟﻤﻌﺎﻤل، ﺴﺎﻟﺒﺔ ﻋﻛﺴﯿﺔ ﻗوﯿﺔ ﺠدا ﻤﻘدا رﻫﺎ )٠,٩٣٤٣-( ﻓﻲ ﺤﺎﻟﺔ اﻟﻤﻌدن اﻟﻤﻌﺎﻤل ﺒﺎﻟﻘذف ﺒﺎﻟﻛرات، ﺴﺎﻟﺒﺔ ﻋﻛﺴﯿﺔ ﻗوﯿﺔ ﺠدا ﻓﻲ ﺤﺎﻟﺔ اﻟﻤﻌدن اﻟﻤﻌﺎﻤل ﺒﺎﻟﻨﺘردة ﻤﻘدارﻫﺎ )٠,٩٣٧٥-(، وﺴﺎﻟﺒﺔ ﻋﻛﺴﯿﺔ ﻗوﯿﺔ ﺠدا ﻤﻘدارﻫﺎ)٠,٩٨-( ﻓﻲ ﺤﺎﻟﺔ اﻟﻨﺘردة واﻟﻘذف ﺒﺎﻟﻛرات.

In this research used correlation analysis in determining the strength and type of correlation between fatigue stress and the number of fatigue cycles while the sample failure reaching to Fatigue Limit, for low carbon alloy steel for various surface treatments as well as determine the effect of treatment surface on this relationship.The Win QSB Program has been used in determining the strength and type of correlation between fatigue stress and the fatigue cycles number. results of the present work show that there is a strong negative relationship between stress and the cycles number of fatigue machine for four groups vary depending on the surface treatment respectively: - alloy steel without treatment is strong negative relation =-0.8934, negative & very strong relation = -0.9343 in case of shoot penning treatment, negative & very strong relation= -0.9375 in case nitriding treatment, negative & very strong relation = -0.98 in case shoot penning & intruding.