اثر رطوبت، سرعت بارگذاری و اندازه دانه بر برخی خواص مکانیکی دانه جو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه محقق اردبیلی

2 دانشیار گروه مهندسی بیوسیستم، دانشگاه محقق اردبیلی

3 دانشیار گروه مهندسی بیوسیستم دانشگاه محقق اردبیلی

چکیده

 
    در این تحقیق برخی خواص مکانیکی دانه جو شامل تغییر شکل در نقطه گسیختگی، نیروی گسیختگی، انرژی گسیختگی و چغرمگی در رطوبت‌های 5/10، 5/12، 5/14 و 5/16 درصد (Wdb) و با سرعت‌های بارگذاریmm.min-1 5، 15، 25 و 35 و در 3 اندازه دانه در آزمایش فاکتوریل در طرح پایه کاملا تصادفی با 7 تکرار بررسی شد. نتایج نشان داد که اثر رطوبت بر نیروی گسیختگی، انرژی گسیختگی، تغییر شکل و چغرمگی در سطح احتمالی 1% معنی‌دار است. همچنین اثر سرعت بارگذاری، بر تغییر شکل در سطح احتمالی 1% معنی‌دار شد. اثر متقابل رطوبت و سرعت بارگذاری نیز بر تغییر شکل و چغرمگی در سطح احتمالی 1% و بر نیروی گسیختگی و انرژی گسیختگی در سطح احتمالی 5% معنی‌دار شد. بعلاوه با افزایش رطوبت تمامی پارامتر‌های مکانیکی مورد آزمایش افزایش داشته‌است و با افزایش اندازه دانه، مقادیر نیروی گسیختگی و تغییر شکل به صورت خطی افزایش داشته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Effects of moisture content, loading rate and grain size on some mechanical properties of barley seed

نویسندگان [English]

  • Azin Zand Miralvand 1
  • Mansour Rasekh 2
  • Ezzatollah Askari Asli Ardeh 3
1 Mohaghegh Ardabili University
2
3
چکیده [English]

This study was carried out to determine some mechanical properties of barley seed including Deformation, Rapture Force, Rapture Energy and toughness as a function of moisture content (10.5%, 12.5%, 14.5% , 16.5%, db), loading rate (5, 15, 25, 35 mm.min-1) and grain size (small, medium, large). Tests were performed at 7 replications by the means of a factorial base plot experiment. The results showed significant effect of moisture content on all the properties (p>0.01).Also there is significant effect of grain size on rapture force, rapture energy and deformation and significant effect of loading rate on deformation at 1% level of probability. The interaction effect of moisture content- loading rate was significant on deformation and toughness (p>0.01) and on rapture force and rapture energy (p>0.05). The more percentage of moisture content, the more mean amount all the measure properties of barley seed. The mean amounts of rapture force and deformation increased linearly as the moisture content increased.

کلیدواژه‌ها [English]

  • barley seed
  • toughness
  • Mechanical Properties
  • rapture force
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