کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7180710 1467845 2016 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Surface contact stress-based nonlinear virtual material method for dynamic analysis of bolted joint of machine tool
ترجمه فارسی عنوان
روش تماس مجازی مواد غیر خطی سطحی با استرس برای تجزیه و تحلیل پویا از پیچ اتصال پیچ و مهره ابزار ماشین
کلمات کلیدی
مواد مجازی غیر خطی، نظریه تماس فراکتال، سطح تماس متوسط ​​استرس، استرس نامتقارن توزیع نشده است مفصل پیچیده،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی صنعتی و تولید
چکیده انگلیسی
The components of machine tools are mainly fixed and connected by bolts. The performance of the assembly can be affected by the dynamic characteristics of the bolted joints. This paper presents a nonlinear virtual material method based on surface contact stress to describe the bolted joint for accurate dynamic performance analysis of the bolted assembly. Fractal geometry theory is used to describe the surface topography. The elastic modulus and shear modulus of one micro-contact are derived based on fractal contact theory. The equivalent elastic modulus, Poisson ratio, and density of the bolted joint can be obtained through the weighted mean method. In order to obtain the stress distribution, the contact surface is assumed flat in the macro-scale, and the uneven distribution of contact stress can be obtained by the finite element method (FEM). The contact surface can be divided into several sections, and the parameters of a virtual material layer can be determined based on the mean contact stress. Both theoretical and experimental results for a bolted joint are obtained for a box-shaped specimen under equal pre-tightening force and bending moment effect. The results show that the theoretical mode shapes are in good agreement with the experimental mode shapes. The relative errors between the theoretical and experimental natural frequencies are less than 4.41%, which indicates that the present nonlinear virtual material method is appropriate for the bolted joint in modeling CNC machine tools.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Precision Engineering - Volume 43, January 2016, Pages 230-240
نویسندگان
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