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مطالعه تاثیر تورق و سطح چسب گذاری بر مدول الاستیسیته و مدول برشی چوب صنوبر توسط آزمون غیرمخرب ارتعاش | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 5، دوره 29، شماره 4 - شماره پیاپی 49، دی 1393، صفحه 550-560 اصل مقاله (683.58 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2014.8458 | ||
| نویسندگان | ||
| احسان حاجی رفیعی ها1؛ مهران روح نیا* 2؛ احمد جهان لتیباری3؛ آژنگ تاج دینی2 | ||
| 1دانشجوی مقطع کارشناسی ارشد، علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج | ||
| 2دانشیار گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج | ||
| 3استاد گروه علوم و صنایع چوب و کاغذ، دانشگاه آزاد اسلامی واحد کرج | ||
| چکیده | ||
| در این تحقیق به بررسی تأثیر تورق و سطح چسب گذاری در فرآوردههای لایهای حاصله از چوب صنوبر، توسط آزمون غیر مخرب ارتعاش آزاد خمشی پرداخته شده است. بدین منظور تعداد 120 نمونه به ابعاد اسمی 5/2×5/2×45 سانتیمتر که عاری از هر گونه عیب ظاهری بودند آماده و تحت آزمون ارتعاش خمشی در تیر دو سر آزاد قرار گرفتند. سپس نمونهها توسط دو برش طولی لایهای شدند و توسط چسب پلی وینیل استات به یکدیگر اتصال پیدا کردند. نمونهها از لحاظ سطح چسب گذاری به چهار سطح قراردادی تقسیم شده، که یک گروه کامل چسب و سه گروه دیگر به طور متفاوت ناقص چسب بودند. نمونهها مجددا تحت آزمون مذکور مورد مطالعه قرار گرفتند. نتایج نشان داد که در مقایسه با مدول الاستیسیته مدول برشی پارامتر حساستری برای شناسائی معایب اتصال و سطح چسبگذاری تیرهای لایهای می باشد به شرطی که نقاط کور آزمون غیرمخرب ارتعاش خمشی در نظر گرفته شود. | ||
| کلیدواژهها | ||
| ارتعاش خمشی؛ مدول الاستیسیته؛ مدول برشی؛ نقص در چسبندگی | ||
| عنوان مقاله [English] | ||
| Shear and elastic moduli of Poplar wood affected by glue coverage deficiency of lamination in a vibration based nondestructive approach | ||
| نویسندگان [English] | ||
| Ehsan Haji rafiriha1؛ Mehran Roohnia2؛ Ahmad Jahan latibari3؛ Ajang Tajidini2 | ||
| 1M.Sc., Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran | ||
| 2Associate Professor, Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran, | ||
| 3Professor, Wood and Paper Science and Technology, Karaj Branch, Islamic Azad University, Karaj, Iran | ||
| چکیده [English] | ||
| The effect of lamination and adhesive coverage rate in layered products made from Poplar wood was studied The effect of lamination and adhesive coverage rate in layered products made from Poplar wood was studied by non-destructive free vibration test. 120 samples with nominal dimensions of 2.5×2.5×45 cm without any obvious deficiencies were selected and free flexural vibration in free-free bars were performed for testing them. Samples were longitudinal cut in three thinner tangential layers and jointed together again using Poly Vinyl Acetate glue. The specimens were divided into four groups according to adhesive coverage rates, which one group was fully glued and 3 groups were carrying some glue deficiencies in different rates. Manipulated samples were tried again in above mentioned test. Results indicated that shear moduli compare to modulus of elasticity is a more sensitive parameter to evaluate glue efficiency in laminated beams but concerns remained due to blind points in flexural vibration nondestructive method. | ||
| کلیدواژهها [English] | ||
| flexural vibration, glue deficiency, longitudinal vibration, Modulus of elasticity, Shear modulus | ||
| مراجع | ||
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