بررسی تاثیر عمق نفوذ و سرعت دیسک برنیروهای برش سنگ بر اساس نتایج شبیه‌سازی با نرم‌افزار LS-DYNA

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر، تهران، ایران

2 شرکت تونل‌ساز ماشین، تهران، ایران

چکیده

نیروهای اعمال شده به دیسک‌های برشی از جمله مهم‌ترین پارامترهای طراحی ماشین‌های حفار در زمین‌های سخت هستند. این نیروها شامل نیروی عمودی و غلطشی می‌باشند. برای طراحی ماشین حفار نیاز به بررسی دقیق نیرو‌های یادشده می‌باشد که تحت تاثیر عواملی چون عمق نفوذ، فاصله‌داری، سرعت خطی و چرخشی دیسک تغییر می‌کنند. از این رو نیاز به آزمایشات برش خطی برای درک تاثیر هریک از موارد یاد شده می‌باشد. از آنجا که آزمایشات برش خطی زمان‌بر و پرهزینه است شبیه‌سازی‌های عددی بادقت زیاد می‌تواند جایگزین مناسبی باشد. در این مقاله با استفاده از نرم‌افزار LS-DYNA ابتدا شبیه‌سازی‌های لازم برای اعتبارسنجی با بررسی دو مدل رفتاری جانسون هالمکوئیست بتن (JHC) و RHT انجام شده است. پس از این مرحله با تکیه بر تغییر متغیر‌هایی از جمله عمق نفوذ، سرعت خطی و چرخشی دیسک به بررسی تاثیر آن‌ها پرداخته شده است. بر اساس نتایج به دست آمده، عمق نفوذ پارامتری بسیار موثر بر نیروی عمودی است. با افزایش عمق نفوذ از 2/5 به 7/6 میلی‌متر نیروی عمودی از ۹۶ به ۱۵۹ کیلونیوتن می‌رسد. این نتیجه با تاثیری بیشتر برای نیروی غلطشی صادق می‌باشد، به این صورت که نیروی غلطشی از 6/1 به 22/5 کیلونیوتن افزایش می‌یابد. با افزایش سرعت خطی و چرخشی دیسک‌ها، نیروهای عمودی و غلطشی کاهش می‌یابد، اما مقدار این کاهش بسیار کم است. بر اساس نتایج به دست آمده، افزایش سرعت خطی از 0/33 به1/65 میلی‌متر تنها باعث کاهش ۱۳ درصدی نیروی عمودی (از ۱۵۵ به ۱۳۵ کیلونیوتن) و کاهش ۵ درصدی نیروی غلطشی (از 20/6 به 19/5 کیلونیوتن) می‌شود.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of the effect of penetration depth and disc speed on cutting forces using LS-DYNA simulations

نویسندگان [English]

  • Shahin Fatahi Dehkbodi 1
  • Ebrahim Farrokh 1
  • Davood Lotfi 2
1 Master's student in rock mechanics, Mining engineering department, Amirkabir university of technology
2 Master of mechanical engineering-applied design, Director of research and development of Tunnelsaz machine
چکیده [English]

The forces imparted upon cutting discs represent crucial design parameters for tunnel boring machines (TBMs) engaged in rock excavation processes. These forces comprise normal and rolling forces, which are influenced by factors including penetration depth, spacing, and linear and rotational velocity of the disc. Therefore, a careful examination of these forces is necessary for the design of effective TBMs. Linear cutting tests are time-consuming and financially prohibitive exercises. Consequently, precision numerical simulations can serve as a suitable alternative approach. In this report, the LS-DYNA software environment was employed to conduct simulations validating two constitutive models of concrete behavior: Johnson Holmquist (JHC) and RHT. The impact of variables such as penetration depth, and linear and rotational motion of the disc on exerted forces was investigated. The findings indicate penetration depth notably impacts both normal and rolling forces. Augmenting depth from 2.5mm to 7.6mm results in escalations of normal force from 96kN to 159kN and rolling force from 6.1kN to 22.5kN. As linear and rotational velocities of discs increase, forces decrease marginally. However, elevating linear speed from 0.33mm to 1.65mm precipitates merely a 13% reduction in normal force (from 155kN to 175kN) and 5% decrease in rolling force (from 20.6kN to 19.5kN), according to the results obtained.

کلیدواژه‌ها [English]

  • Disc Cutter
  • LS-DYNA simulation
  • LCM Test
  • normal force
  • rolling force

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نشریه مهندسی عمران امیرکبیر
دوره 55، شماره 12
1402
صفحه 2487-2502

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