| تعداد نشریات | 286 |
| تعداد نشریات سازمان | 84 |
| تعداد شماره‌ها | 3,020 |
| تعداد مقالات | 33,745 |
| تعداد مشاهده مقاله | 44,993,425 |
| تعداد دریافت فایل اصل مقاله | 47,804,325 |
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 | ||
|
-Alberktas, D. and Vobolis, J., 2004. Modeling and Study of Glued Panel, Materials Science (medziagotyra), 10(4):370-373
-Arumugam, V., Sajith, S. and Joseph Stanley, S., 2011. Acoustic Emission Characterization of Failure Modes in GFRP Laminates Under Mode I Delamination, J Nondestruct Eval, 30:213–219
-ASTM, 2002, Standard Test Method for Dynamic Young’s Modulus, Shear Modulus and Poisson’s Ratio of Refractory Materials by Impulse Excitation of Vibration, Designation C1548. 7p
-Baldassini, N., Piazza, M. and Zanon, P., 1996. In Situ Evaluation of Mechanical Properties of Timber Structural Elements, In Proceedings of 10th International Symposium on NDT of Wood, Lausanne, 396-378
-Bodig, J. and Jayne B., 1982. Mechanics of wood and wood composites (Persian translated by G. Ebrahini), University of Tehran press, p686
-Brancheriau, L. and Bailleres, H., 2002, Natural vibration analysis of clear wooden beams: a theoretical review, Wood Science and Technology, Springer-Verlag Vol. 36: 347-365
-Bucur, V., 2006. Nondestructive characterization and imaging of wood, 2nd ed. Springer Series in Wood Science Springer, Berlin, Heidelberg, Germany, 354 p
-Camille, A.I. and Ziad, K., 2005. Advanced wood engineering: glulam beams, Construction and Building Materials 19, 99–106
-Dill-Langer, G., Bernauer, W. and Aicher, S., 2005. Inspection of Glue-lines of Glued-laminate Timber by Means of Ultrasonic Testing, 14th International Symposium on Nondestructive Testing of Wood, Germany, 2-4 May, 49-60
-Divos, F. and Tanaka,T., 2005. Relation between Static and Dynamic Modulus of Elasticity of Wood, Acta Silv. Lign. Hung, Vol. 1 pp. 105-110
-Karimi, A.N., Talaee, A. and Tootoonchian, T., 2008. Atlas of world commercial woods, University of Tehran press, p134
-Keyang, Lu., Feng, Fu., Zhiyong, CaiandLiwei and Jin., 2009. Nondestructive Methods for Evaluating Mechanical Properties of Wood Electromagnetic Shielding Composite , 16thInternational Symposium on NondestructiveTesting and Evaluation of Wood , 208 – 215
-Kohantorabi, M., Ghaznavi, M., Roohnia, M., Tajdini, A. and Kazeminajafi, S., 2011. Effect of joint type on acoustical properties in jointed beams, Journal of science and techniques in natural resources, 6(4): 117-128
-Kuklik, P. and Doipjs, J., 1999. Nondestructive Evaluation of Structural Timber, In Proceedings of 5th World Conference Timber Engineering, Montreux, 1:692-699
-Laufenberg, T.L., 1982. Exposure Effect upon Performance of Laminated Veneer Lumber and Glulam Materials, Forest Products Journal, 32(5):42-48
-Mehdinia, M., Tabarsa, T. and Sadeghian, M., 2011. Investigation the plywood manufacturing of paulownia and phenol formaldehyde adhesives, Iranian Journal of wood and paper industries, 2(1): 81-89
-Nzokou, P., Freed, J. and Kamden, D.P., 2006. Relationship between Nondestructive and Static Modulus of Elasticity of Commercial Wood Plastic Composites .Hols als Roh, und Werkstoff, 64:90-93
-Otadi, F., 2000. Investigation on growth rate and specifications of Paulownia wood, Mazandaran wood and paper company research center
-Renn, R.J. and Kim, J.B., 1999. Nondestructive Evaluation of the Stiffness and Strength of In Situ Timber Structural Members, In Proceedings of 1st RILEM Symposium on Timber Engineerings, Stockholm, 275-284
-Roohnia, M., Doosthoseini, K., Khademieslam, H., Gril, J. and Bremaud, I., 2006. A Study on Variations of Specific Modulus of Elasticity and Shear Moduli in Arizona Cypress Wood, using Vibration Method, Journal of the Iranian Natural Res., 59(4): 921-933
-Roohnia, M., Yavari, A. and Tajdini, A., 2010. Elastic parameters of poplar wood with end-cracks, Ann. For. Sci. 67:409p1-6
-Roohnia, M., Hashemi-dizaji, S.F., Brancheriau, L., Tajdini, A. and Manouchehri, N., 2011. Effect of soaking process in water on the acoustical quality of wood for traditional musical instruments, BioResources, 6(2): 2055-2065
-Roohnia, M., Alavi-tabar, S.E., Hossein, M.A., Brancheriau, L. and Tajdini, A., 2011. Dynamic modulus of elasticity of drilled wooden beams, Nondestructive Testing and Evaluation. 26(2):141-153
-Tucker, B. and Bender, D.A., 2003. Continuous Ultrasonic Inspection of extruded wood-plastic composites, Forest products J, 53، 6:27-23
-Wang, S., Chen, J., Tsai, M., Lin, C. and Yang, T., 2008. Grading of Softwood Lumber Using Non-destructive Techniques, Journal of Material Processing Technology, 208:149-158
-Yan, Y.J. and Yam, L.H., 2002. Online detection of crack damage in composite plates using embedded piezoelectric actuators/sensors and wavelet analysis, Compos. Struct. 58, 29–38 | ||
|
آمار تعداد مشاهده مقاله: 2,215 تعداد دریافت فایل اصل مقاله: 1,712 |
||