Abrasive jet micromachining of acrylic and polycarbonate polymers at oblique angles of attack

A level set methodology for predicting the surface evolution of inclined masked micro-channels resulting from abrasive jet micro-machining at oblique incidence

“…The model was further extended to the AJM of ductile materials, such as PMMA and polycarbonate [2,10], by using a semi-empirical function to describe the dependence of the erosion rate on the angle of attack [2]. In another work, Ghobeity et al [11] developed an analytical model to approximate the spatial distribution of 'erosive efficacy', i.e.…”

Thermal analysis of cryogenically assisted abrasive jet micromachining of PDMS

“…For example, in Ref. [9] it was demonstrated that the model predictions of profile shape and machined channel depth were in very good agreement (less than 10% error) with the predicted results for various ductile polymers.…”

“…Such a channel shape, also seen in the AJM of ductile polymers such as polymethylmethacrylate [8] and polycarbonate [9] at room temperature, is characteristic of ductile erosive systems. Therefore, the cooled PDMS in the present work was also assumed to erode in ductile manner, and the appropriate two-dimensional surface evolution model is [9] Z n…”

“…In previous papers, the model was modified and surface evolution equations were obtained that quite accurately predict the machined profile evolution in masked and unmasked micro-channels in both ductile and brittle erosive systems [8,9,39,[45][46][47]. For example, in Ref.…”

“…Although previous investigations have shown that AJM can be used on polymers such as acrylics and polycarbonate [8][9][10], elastomers such as polydimethylsiloxane (PDMS) are impossible to abrasive jet machine under ambient temperature conditions [10,11]. The mechanical properties of many materials, including polymers and elastomers, change significantly at low temperatures [12][13][14][15].…”