This paper investigates the effect of cutter clearance angle on variation of depth of cut and cutting process with an actuated disc cutting(ADC).ADC is a cyclic cutting method with two main characteristics:(i)a disk-s...This paper investigates the effect of cutter clearance angle on variation of depth of cut and cutting process with an actuated disc cutting(ADC).ADC is a cyclic cutting method with two main characteristics:(i)a disk-shape cutter is used to attack the rock in an undercutting mechanism;and(ii)the cutter is dynamically actuated as it is moved across the rock.Hence,the cutting process of such system is periodic,each recurrence known as actuation cycle.The first ADC model,developed in 2016,represented an idealization of the technology with a flat disc cutter,where no clearance angle was considered.The evolution of the contact between the disc and the rock was,therefore,computed only on horizontal x-y plane,ignoring the effect of normal component of the force acting on cartridge.This article reports on a study that incorporates the cutter inclination angle in derivation of cutter/rock interface laws.It extends the proposed kinematic and geometry based model to take into account the variable depth of cut in estimating the forces associated with cutting in one actuation cycle.Experiments were conducted using Wobble to test the predictions of the improved model at various operating conditions.The model predictions are matched with the experimental results and effects of various factors are analysed.展开更多
Magnetic kirigami with tunable configurations under magnetic actuation is of significant interest in various emerging fields.However,there remains a grand challenge to develop magnetic kirigami with a facile fabricati...Magnetic kirigami with tunable configurations under magnetic actuation is of significant interest in various emerging fields.However,there remains a grand challenge to develop magnetic kirigami with a facile fabrication strategy,programmable mag-netization,and functionality.In this work,we present a novel magnetic kirigami that is readily fabricated by the laser cutting technique.The magnetic kirigami consists of an array of magnetic microplates,each with a programmed magnetization.By applying an actuation magnetic field,each microplate can rotate and even flip,allowing for predesigned kirigami configura-tions.By further coating the surface of the microplate array,the magnetic kirigami can be programmed with functionality.We demonstrate a potential application of information encryption by engineering magnetic kirigami into a magneto-responsive QR code.Providing a simple fabrication strategy,our work paves the way for other applications of magnetic kirigami.展开更多
基金Minerals Research Institute of Western Australia, Mining3 and CSIRO for funding this work
文摘This paper investigates the effect of cutter clearance angle on variation of depth of cut and cutting process with an actuated disc cutting(ADC).ADC is a cyclic cutting method with two main characteristics:(i)a disk-shape cutter is used to attack the rock in an undercutting mechanism;and(ii)the cutter is dynamically actuated as it is moved across the rock.Hence,the cutting process of such system is periodic,each recurrence known as actuation cycle.The first ADC model,developed in 2016,represented an idealization of the technology with a flat disc cutter,where no clearance angle was considered.The evolution of the contact between the disc and the rock was,therefore,computed only on horizontal x-y plane,ignoring the effect of normal component of the force acting on cartridge.This article reports on a study that incorporates the cutter inclination angle in derivation of cutter/rock interface laws.It extends the proposed kinematic and geometry based model to take into account the variable depth of cut in estimating the forces associated with cutting in one actuation cycle.Experiments were conducted using Wobble to test the predictions of the improved model at various operating conditions.The model predictions are matched with the experimental results and effects of various factors are analysed.
基金National Natural Science Foundation of China(Project Nos.51975597,21872176,22072185,and 12272369)Natural Science Foundation of Guangdong Province(Project Nos.2019A1515011011 and 2022A1515011065)+3 种基金Special Support Plan for High Level Talents in Guangdong Province(Project No.2017TQ04X674)Key Research and Development Plan of Guangdong Province(Project No.2018B0909060)Pearl River Talents Program of Guangdong Province(Project No.2017GC010671)Organized scientific research project of Guangdong Normal University of Technology(Project No.22GPNUZDJS21).
文摘Magnetic kirigami with tunable configurations under magnetic actuation is of significant interest in various emerging fields.However,there remains a grand challenge to develop magnetic kirigami with a facile fabrication strategy,programmable mag-netization,and functionality.In this work,we present a novel magnetic kirigami that is readily fabricated by the laser cutting technique.The magnetic kirigami consists of an array of magnetic microplates,each with a programmed magnetization.By applying an actuation magnetic field,each microplate can rotate and even flip,allowing for predesigned kirigami configura-tions.By further coating the surface of the microplate array,the magnetic kirigami can be programmed with functionality.We demonstrate a potential application of information encryption by engineering magnetic kirigami into a magneto-responsive QR code.Providing a simple fabrication strategy,our work paves the way for other applications of magnetic kirigami.
