تعیین مدول الاستیسیته ماده مرکب الیاف طبیعی-ترموپلاستیک

نوع مقاله: مقاله پژوهشی

نویسنده

استادیار دانشگاه علوم کشاورزی و منابع طبیعی ساری، ساری، ایران

چکیده

در تحقیق حاضر از سه روش آزمون فشاری استاتیک، آزمون بارگذاری-حذف بار و فراصوت برای تعیین مدول الاستیسته ماده مرکب الیاف طبیعی- پلی‌پروپیلن ساخته شده به روش اکستروژن استفاده گردید. نتایج نشان داد که این ماده مرکب از ماهیت ارتوتروپیک برخوردار است و مدول دینامیک حاصل از آزمون فراصوت از مقدار بیشتری در مقایسه با دو مدول دیگر برخوردار است. همچنین با افزایش مدول حاصل از آزمون حذف بار، درصد اختلاف بین مدول حذف بار و مدول دینامیک کاهش یافت. نتایج همچنین نشان داد که استفاده از روش رایج تعیین مدول (مدول تانژانت در 10 تا 40 درصد تنش نهایی) برای این ماده، سبب می‌شود مقدار مدول بسیار کمتر از مقدار واقعی برآورد گردد.

کلیدواژه‌ها

موضوعات


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