تحديد إعادة توزيع الإجهاد المتبقي لسبيكة الألومنيوم T351 2024 بواسطة اختبار صلادة فيكرز
الكلمات المفتاحية:
الصلادة الدقيقة، الإجهاد المتبقي، القصف بالكريات، التعب، وسبائك الألومنيومالملخص
This study investigated the evolution of microhardness, fracture toughness, and residual stress in a 2024-T351 aluminum alloy under cyclic loading after various shot peening treatments. A modified Vickers indentation instrument, coupled with three different indentation models, was used to measure these properties. The experiments were conducted using variable amplitude tests on samples subjected to three different shot peening intensities: 4-6A, 6-8A, and 8-10A. The samples were tested under cyclic loading at two applied stress levels, 170 MPa and 280 MPa, for 1, 2, 10, 1000, and 10,000 cycles. Experimental results show that microhardness was reduced by 34% for samples treated with an 8-10A shot peening intensity after 10,000 cycles under a -280 MPa load. The reduction in microhardness is attributed to the relaxation of residual stress, with the rate of reduction being influenced by the material's percentage of cold work.
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