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1

Numerical validation of drilling of Al6061-T6 with experimental data

Elango Prashant, Marimuthu K. Prakash

Mechanics and Mechanical Engineering

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2019

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Vol. 23, nr 1

287--290

EN

Drilling is a cutting process that uses a drill bit to cut a circular profile in workpiece. Forces acting on the drill bit reduce its life expectance. Analysis of forces acting on the drill bit during drilling prevents the tool from failing prematurely because of wear and excess feed rate. Excess feed rate can induce excessive internal stress on both the tool and workpiece. This paper aims to study the effects of reaction force acting on a drill bit during drilling of Al6061-T6. A numerical finite element simulation study is performed with commercially available software called Abaqus. Simulation results depend on the right choice of material property such as Johnson-Cook material property and Johnson-Cook damage property. Validation of material property is achieved by comparison of experimental results with simulative results. Reaction force acting against the drill bit during drilling is compared.

2

Vibration of the oscillator exchanging mass with surroundings

Starosta R., Sypniewska-Kamińska G., Awrejcewicz J.

Vibrations in Physical Systems

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2016

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Vol. 27

333--338

EN

Vibration of two simple open systems (namely the linear mass-sprins oscillator and the mathematical pendulum) are investigated. During the motion, the body absorbs matter through its boundary. In both cases, mechanism of mass absorption is modeled as a perfectly 'inelastic' collision and constant rate of mass change is assumed. The paper is focused on the influence of mass change on the kinematic aspects of oscillations.

3

Estimation of the contact forces between the hexapod legs and the ground during walking in the tripod gait

Grzelczyk D., Stańczyk B., Awrejcewicz J.

Vibrations in Physical Systems

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2016

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Vol. 27

107--114

EN

The paper is devoted to the dynamical modelling of the hexapod robot walking on a flat and hard ground. The main goal is to determine time series of reaction forces acting on individual legs of the robot during tripod gait often used both by the six-legged insects as well as mobile walking robots found in engineering applications. The movement of the considered robot is realized by the kinematic excitation of its legs using the so-called Central Pattern Generator (CPG) method. The paper demonstrates that there are different contact forces and overload acting on the robot, resulting from different models working as a CPG. The mentioned forces belong to the important issues that should be taken into account when the robot locomotion on the unknown terrain is planned.

4

Stanowiska do badań sił reakcji korzeni buraka cukrowego na zadane typy obciążeń mechanicznych

Kołodziej P., Gołacki K.

Inżynieria Rolnicza

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2006

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R. 10, nr 5(80)

273-281

PL

W pracy przedstawiono konstrukcję stanowisk do pomiarów sił reakcji korzeni buraków cukrowych na zadawane typy obciążeń mechanicznych. Uwzględniono separację kierunków działania sił zgodnie z przyjętym podziałem procesu wyorywania na funkcje częściowe. Wyznaczono wartości sił oraz ich przebiegi w czasie, z prędkościami oddziaływania narzędzia zawierającymi się w zakresie prędkości uzyskiwanych przez lemiesz wyorywacza wibracyjnego. Do rejestracji wyników badań wykorzystano zestaw pomiarowy i oprogramowanie firmy Hottinger Baldwin Messtechnik.

EN

This paper describes the construction of measuring positions used for determining of sugar beet root reactive forces on some types of mechanical loads. The separation of reactive forces directions was considered according to the given division of lifting process into partial functions. The article presents the course of force values in loading conditions which are similar to real conditions. Measuring set and HBM software were used for data collecting and data processing.

5

Modelowanie niegładkiego układu typu Picus Viridis

Grzesikiewicz W.

Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska

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1998

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z. 7

143-148

PL

Przedstawiono metodę formułowania opisu ruchu niegładkiego układu typu / W 1/irtis. Cechą znamienną tego układu są jednostronne ograniczenia realizowane za pomocą niedoskonałych sił reakcji. Opis ruchu ma postać zestawu warunków określających przyśpieszenia ciał oraz warunków , za pomocą których są wyznaczane prędkości po uderzeniu . Według prezentowanego opisu ruchu opracowano komputerową symulację i animację układu.

EN

This paper presents a method to formulate the description of motion of a non-smooth system of the Pbtt 1/ii-iJb type. The feature of this system are unilateral limitations of motion (constraints ) whi h are executed by non-ideal reactions forces. The description of motion has a form of the set of conditions f r accelerations of bodies of the system with which the post-impact velocities are determined. Presented description has been implemented for the computer code for simulation and animation of motion of the system.