Diamond Stylus Research Articles

Comparison Analysis of Roundness Measurement of Small Cylindrical Workpieces with Different Styluses.

To investigate the high-accuracy roundness metrology of a needle roller 1.5 mm in diameter and 5.8 mm in length using the stitching linear scan method, a ruby ball stylus with a tip radius of 150 μm and a diamond stylus with a tip radius of 2 μm were employed to perform experiments under the same conditions. The precision coordinate data, derived from the needle roller's cross-sectional circumference, were segmented into uniform eighths, each scanned with the stylus of a roughness measuring machine. The roundness profile of the needle roller was obtained by stitching the arc profiles, which were characterized according to the precision coordinate data of the arcs. The cross-correlation function, Euclidean distance, residual sum of squares, position error, and curvature of the measured arcs were used to evaluate the results, which can reflect the performance of the stylus. A comparison of the results obtained using the ruby ball stylus versus the diamond stylus demonstrates the ruby ball stylus' greater suitability for use in the roundness metrology of the needle roller bearing examined in this paper.

Enhanced Biocompatibility and Osteogenic Property of Biodegradable Zn-0.5Li Alloy through Calcium–Phosphorus Coating

Zinc and its alloys have garnered significant attention in the field of biological implantation due to their biodegradable, osteogenic, and mechanical properties. However, the degradation of zinc and its alloys always lead to an increase in local ion concentration, and the bare metal surfaces lack biocompatibility for implantation. To address these issues, a layer of calcium–phosphorus (CaP) coating was prepared on the surface of a Zn-0.5Li alloy. The micro-structure of the coating was observed with scanning electron microscopy (SEM) and a white light interferometry microscope. The phases of the coatings were characterized through X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The bonding strength between the coating and substrate was investigated using a scratch tester with a diamond stylus, and the corrosion properties were assessed using an electrochemical method. For the evaluation of biocompatibility and osteogenic properties, MC3T3-E1 cells were cultured on the coating. Live/dead staining and proliferation tests were performed to assess cell viability and growth. Cell adhesion morphology was observed with SEM, and the level of alkaline phosphatase (ALP) in the MC3T3-E1 cells cultured on the material surface was evaluated by ALP staining and activity measurement. The CaP coating on the zinc alloy surface improved the alloy’s biocompatibility and osteogenic property, and could be a promising surface modification option for a biodegradable zinc alloy.

High-accuracy roundness measurement of small cylindrical workpieces by a high-frequency filtering method

In this paper, a ruby ball stylus is employed as hardware filtering for high-frequency data in the stitching linear scan method for the roundness and diameter measurement of small cylinders (diameter less than 3 mm). The conventional rotary scan method is improper for measuring small cylinders due to the crucial alignment. Thus, the stitching linear scan method is proposed, with which the cross-sectional circle of small cylinders is divided into several arcs to be measured and stitched. Although small cylinders can be measured by this method, the final results of roundness and diameter are affected by the low-accuracy stitching due to the high-frequency data. To address this issue, a ruby ball stylus with a tip radius of 150 μm is used for eliminating the influence of high-frequency data which is obtained by a diamond stylus with a tip radius of 2 μm in the stitching linear scan method. Since the measuring force of the ruby ball stylus influences the measurement of the small cylinders very much, a series of new alignments are carried out. Two groups of experiments by ruby ball stylus and diamond stylus have been conducted under the same conditions respectively. Results show that the average matching coefficient of adjacent arc profiles is enhanced by 86% and the repeatability of the ruby ball stylus is better than the diamond stylus.

Evaluation of Struthiocamelus eggshell as an in vitro alternative to extracted human teeth in preliminary screening studies on dental erosion.

This in vitro work investigates the potential of ostrich eggshellas a substitute for extracted human teeth in preliminary screening studies on dental erosion. Additionally, it aims to demonstrate the potential of ostrich eggshell compared to human enamel in evaluating the efficacy of a preventive agent in protecting against dental erosion, using an artificial mouth model. The experiment utilized 96 erosion testing specimens from each substrate, human enamel, and ostrich eggshell. The specimens were subjected to six different experimental regimens of increasing erosive challenge, simulating the consumption of an acidic drink. The acidic drink was delivered at a consistent volume and duration range. Both artificially stimulated and unstimulated saliva flowed throughout the experimental regimens. Surface hardness was measured using a Through-Indenter Viewing hardness tester with a Vickers diamond, while surface profiling was done using a surface contacting profilometer with a diamond stylus. An automated chemistry analyzer system was used to detect calcium and phosphate ions. The study found that ostrich eggshell specimens demonstrated predictable surface loss, hardness drop, and ion loss due to the acidic challenge. Meanwhile, enamel appeared to fall short in terms of surface hardness predictability. The transient hardness loss phase, which manifests as an overlooked decrease in surface hardness despite significant ion and structural loss, may explain this phenomenon. The experiment showed that assessing surface loss is essential in addition to hardness testing, particularly as certain experimental conditions may produce a false perception of tissue recovery despite the actual surface loss. By analyzing the response of ostrich eggshell specimens to erosive challenges, researchers were able to identify an "overlooked" reduction in hardness in enamel specimens. The differences in the structure, chemical composition, and biological response to erosion in the presence of artificial saliva between enamel and ostrich eggshell could explain their distinct behaviors.

Effect of carbide orientation during single scratch test in directionally solidified and heat-treated high chromium cast irons

In this work, a billet of eutectic high chromium cast iron, material commonly used in highly abrasive environments, such as in grinding and milling, was unidirectionally solidified. The resulting microstructure was composed of oriented M7C3 carbides and eutectic matrix. Specimens were cut parallel and transversally to the billet axis and split into two groups. Both were heat treated with different austenitization temperatures. The temperature for the first group was 1100 °C, and the value for the second was 950 °C, providing matrix instrumented indentation hardness values of 8.0 and 6.3 GPa, respectively. This procedure resulted in specimens with three carbide directions dispersed in two different matrices. Samples were evaluated by means of single scratch test with a cono-spherical diamond stylus under progressive and constant normal load conditions. To support the analysis, a non-contact 3D surface profiler and scanning electron microscopy (SEM) were used to characterize the scratched surfaces. Progressive load tests indicated a transition in wear micro-mechanisms which was mainly observed in the samples with the long axes of the carbides parallel to the wear surface and oriented orthogonal to the scratch direction and with matrix hardness of 6.3 GPa. On the other hand, constant load tests showed that carbides with the long axes parallel to the wear surface and oriented parallel to the scratch direction tend to produce deeper scratchers with higher ridges than in the other directions. Results also indicate that the hardness, despite being an important variable, does not entirely explain the behavior of the material under single scratch, since the orientation of the carbides with respect to the scratch direction must also be considered.

Effects of deposition temperature on structure, residual stress and corrosion behavior of Cr/TiN/Ti/TiN films

Composite TiN film was prepared on AZ31 at four sets of different deposition temperatures. X-ray diffraction and X-ray fluorescent were employed to determine the structure, residual stress, thickness and chemical elements. A scratch tester with Rockwell C diamond styli and electrochemical workstation were used to evaluate the adhesion and corrosion behavior of the obtained film. The effects of deposition temperature on structure, residual stress, adhesion, thickness and corrosion behavior were investigated as well. The results show that the films are composed of TiN with (111), (200) and (222) planes, Ti with (002) plane, and Cr (110) plane. The maximum residual compressive stress is about 413.4 MPa, and the elements distribution is not uniform when the film deposited at 150 °C. With the increase of deposition temperature, the grain size and crystallinity increase, the thickness decreases, the residual stress decreases first and then increases, the film becomes more compact and has better corrosion resistance. However, when the deposition temperature is greater than 250 °C, the surface roughness and the thermal stress begin to increase, the bonding performance and the corrosion resistance also decrease.

Investigating the adhesion strength of electrodeposited Ni-Al2O3 nano composite on Al-2618 substrate by using the scratch test technique

Conventional electrodeposition is used to develop Ni-Al2O3 nano-composite over the Al-2618 surface through nickel-plated immersion. Scratch investigation was carried out with respect to various process parameters such as immersion temperature, packing of particles and current density. The scratch resistance of electrodeposition composition was determined with the Ducom TR102-Scratch testing device and it was fortified with Rockwell C diamond stylus (0.2 mm rad.). Microscopic analysis was made of the morphology and scratch stages of the electrodeposited layer.The results indicates coating layer narrowly imitates the surface contour, as well as the toughness of a substance is influenced by its strength. Also the better adhesive strength could be achieve by higher temperatures, moderate particle loading and current density.

Surface Texture Measurement with Profile Method Using Six-Axis Coordinate Measuring Machine

Currently the measurement of surface texture in mechanical engineering is traditionally carried out using profilometers. Modern profilometers do not allow measuring of surfaces with complex shapes. This is due to the different sensitivity of the sensor and the discreteness of the movements along the axes of the Cartesian coordinate system. Coordinate Measuring Machines are devoid of such a drawback. However, stylus of the coordinate measuring machine has a diameter many times larger than the diamond stylus of the profilometer. Therefore, there is a mechanical filtering effect, that affects the results of measuring the parameters of the surface texture. In this paper a mathematical model of the contact of the spherical stylus and a rough surface based on analytical geometry is proposed. Influence of the diameter of the spherical stylus on the maximum measurement errors of a amplitude parameters are investigated. Seven amplitude parameters Rp, Rv, Rz, Ra, Rq, Rsk, Rku of the surface texture are modeled. Coordinate measuring machine and profilometer with stylus diameter of 2 μm measurement results are compared. it was concluded that the stylus diameter of the coordinate measuring machine when measuring the surface texture should be no more than 20 μm.

Study on scratch behavior of Ni-Al2O3 coating composition on Al-2219 substrate by electro deposited technique

Ni-nano-Al2O3 nano-composite coatings in a nickel-plated bath have been prepared through the traditional electrodeposition process on the Al-2219 substrate. In respect of process variables like immersion temperature, current density, and loading of elements, scratch resistance behavior was carried out. The morphology and scratch phases of the electrodeposited coating was analyzed by microscope. The scratch test was carried out by Ducom TR 101-Scratch testing apparatus which equipped with a Rockwell C diamond stylus (200 μm radius). It was found that the coating layer very closely replicates the surface profile, also the load of traction was affected by the strength of material. In further the adessive strength of the coating was increased by reducing the temperature.

Third Body Wear of UHMWPE-on-PEEK-OPTIMA™.

PEEK-OPTIMA™ is being considered as an alternative to cobalt chrome (CoCr) in the femoral component of total knee replacements. To date, investigations of ultra-high molecular weight polyethylene (UHMWPE)-on-PEEK have shown an equivalent wear rate to conventional implant materials under standard conditions. In this study, the third body wear performance of UHMWPE-on-PEEK was directly compared to UHMWPE-on-CoCr in a series of pin-on-plate studies using two approaches for third body damage. Damage simulation with particles of bone cement showed a significant (p < 0.001), four-fold increase in the mean surface roughness of PEEK plates compared to CoCr. However, wear simulation against the damaged plates showed no significant difference in the wear of UHMWPE pins against the different materials (p = 0.59), and a polishing effect by the pin against the PEEK plates was observed. Scratching PEEK and CoCr counterfaces with a diamond stylus to create scratches representative of severe third body damage (4 µm lip height) resulted in a significantly higher (p = 0.01) wear of UHMWPE against CoCr compared to PEEK and again, against PEEK plates, polishing by the UHMWPE pin led to a reduction in scratch lip height. This study shows that in terms of its wear performance under third body wear/damage conditions, UHMWPE-on-PEEK differs from conventional knee replacement materials.

The influence of a calcium sulphate bone void filler on the third-body damage and polyethylene wear of total knee arthroplasty.

ObjectivesBone void fillers are increasingly being used for dead space management in arthroplasty revision surgery. The aim of this study was to investigate the influence of calcium sulphate bone void filler (CS-BVF) on the damage and wear of total knee arthroplasty using experimental wear simulation.MethodsA total of 18 fixed-bearing U2 total knee arthroplasty system implants (United Orthopedic Corp., Hsinchu, Taiwan) were used. Implants challenged with CS-BVF were compared with new implants (negative controls) and those intentionally scratched with a diamond stylus (positive controls) representative of severe surface damage (n = 6 for each experimental group). Three million cycles (MC) of experimental simulation were carried out to simulate a walking gait cycle. Wear of the ultra-high-molecular-weight polyethylene (UHMWPE) tibial inserts was measured gravimetrically, and damage to articulating surfaces was assessed using profilometry.ResultsThere was no significant difference (p > 0.05) between the wear rate of implants challenged with CS-BVF (3.3 mm3/MC (95% confidence interval (CI) 1.8 to 4.8)) and the wear rate of those not challenged (2.8 mm3/MC (95% CI 1.3 to 4.3)). However, scratching the cobalt-chrome (CoCr) significantly (p < 0.001) increased the wear rate (20.6 mm3/MC (95% CI 15.5 to 25.7)). The mean surface roughness of implants challenged with CS-BVF was equivalent to negative controls both after damage simulation (p = 0.98) and at the conclusion of the study (p = 0.28).ConclusionWhen used close to articulating surfaces, a low-hardness, high-purity CS-BVF had no influence on wear. When trapped between the articulating surfaces of a total knee arthroplasty, CS-BVF did not scratch the surface of CoCr femoral components, nor did it increase the wear of UHMWPE tibial inserts compared with undamaged negative controls.Cite this article: R. M. Cowie, S. S. Aiken, J. J. Cooper, L. M. Jennings. The influence of a calcium sulphate bone void filler on the third-body damage and polyethylene wear of total knee arthroplasty. Bone Joint Res 2019;8:65–72. DOI: 10.1302/2046-3758.82.BJR-2018-0146.R1.

ОСНОВНЫЕ ОСОБЕННОСТИ ВЛИЯНИЯ УЛЬТРАЗВУКОВЫХ КОЛЕБАНИЙ ПРАВЯЩЕГО ИНСТРУМЕНТА НА ЭФФЕКТИВНОСТЬ ПРОЦЕССА ПРАВКИ ШЛИФОВАЛЬНЫХ КРУГОВ

The authors developed the technique of the study of influence of axial ultrasonic vibrations of a core diamond dressing tool (DT) in the process of dressing of a grinding wheel: on the normal component Py of dressing force, on the wear of the dressing tool diamonds, on the formation of the wheel working surface texture (WWS). The WWS texture parameters were studied by the following methods: sensing on a profile recording instrument using a diamond stylus (parameters are the bearing length ratio tр at the fixed level р and the mean pitch between grains); optical microscopy using the MBS-2 microscope (parameters are the bearing surface ratio η of a grinding wheel). In parallel, the authors carried out the fractographic study of the WWS texture using the LEO 1455VP scanning electron microscope. The study shows that in the condition of ultrasonic dressing (UD) of a wheel, the DT wear slightly influences the changes in the bearing surface ratio η of the WWS texture. Therefore, the ultrasonic dressing can ensure higher stability of cutting power of a wheel and the DT can work up to wear-out. The authors give recommendations on the selection of the ultrasonic dressing parameters: 1. It is recommended to select the oscillation frequency from the frequencies specified by the State All-Union standard 16165-80: (18±1.26) kHz; (22±1.54) kHz; (44±3.08) kHz; (66±4.62) kHz. 2. It is impractical to specify the DT amplitude of forced oscillations A higher than 15…20 micron. 3. When selecting the dressing depth tп it is necessary to consider the condition of mandatory intermittent interruption of contact of DT with WWS according to the inequality: 0≤tП≤2A.

Mitigation of damage during surface finishing of sapphire using laser-assisted machining

Machining of hard, crystalline ceramics is time-consuming, expensive and vital in many industries, but getting good results is challenging because of the surface damage it can cause. For sapphire machining damage can be especially detrimental because it can create significant stresses in the surface and sub-surface regions. Worst case, the stresses are relieved by crack propagation, fracture, and chipping at the surface. Conventional machining with a single point diamond-turning machine was compared to the same method with a laser simultaneously focused through a diamond stylus. The laser makes ductile machining more favorable and provides in situ annealing of damage. Micro-Raman spectroscopy was used to quantify residual stresses and optical microscopy was used to identify cracking. A reduction in the residual stresses was achieved when using the laser. This is seen most dramatically at higher laser powers, where fracture, cracking and chipping can be alleviated.

Study on the Nanomechanical and Nanotribological Behaviors of PEEK and CFRPEEK for Biomedical Applications

This study was to investigate the nanomechanical and nanotribological properties of polyether ether ketone (PEEK)-based composites for biomedical applications and to gain a fundamental understanding of the effects of carbon fibers in carbon-fiber-reinforced PEEK (CFRPEEK) on the mechanical properties and wear performance in a microscale. Nanoindentation tests with a Berkovich indenter and nanoscratch experiments with a diamond stylus were performed on PEEK and CFRPEEK samples. The nanowear features and mechanisms of the tested samples were analyzed using 3D white-light interfering profilometry and scanning electron microscopy (SEM). The obtained results indicated that the reinforced carbon fibers increased the nanohardness and elastic modulus and decreased the friction coefficient and wear rate of PEEK. Different to many existing studies where a constant load was used in a nanoscratch test and the normal load was a key factor influencing the scratch performances of the tested specimens, stick–slip phenomena were observed on both PEEK and CFRPEEK in the nanoscratch tests with load increasing progressively. In constant load conditions, it was found that the major nanowear mechanisms of PEEK are adhesion, abrasion, and plastic deformation, while the nanowear mechanisms of CFRPEEK are dominated by severe adhesive wear, abrasive wear and mild fatigue. CFRPEEK has demonstrated superior nanomechanical and nanotribological performances, and hence can be considered a potential candidate for biomedical applications.

Fracture Toughness of Thick Boride Layers Estimated by the Cross-Sectioned Scratch Test

New results about the fracture toughness (Kc) of thick boride layers estimated by the cross-sectioned scratch test are presented in this study. The FeB-Fe2B layers developed at the surface of borided AISI 1018 and AISI 1045 steels and the Fe2B layer formed on the borided AISI 1045 steel exposed to a diffusion annealing process (DAP) were used for this purpose. The cross-sectioned scratch tests were performed with a Vickers diamond stylus drawn across the thick boride layer under a constant load to produce a half-cone-shaped fracture near to the top surface of the borided steels. The height of the half-cone-shaped fracture as a function of the cross-sectioned scratch loads was used to determine the fracture toughness of the FeB and Fe2B layers. The results showed a fracture resistance of $$\sim2.8\,{\text{MPa}}\sqrt m$$ for the FeB layer formed at the surface of borided AISI 1045 steel. Likewise, the effect of the DAP on the surface of the borided AISI 1045 steel promoted the formation of an exclusively Fe2B layer, with an increase in the fracture toughness of the whole boride layer around $$5\,{\text{MPa}}\sqrt m$$ . Finally, the principle of the technique can be used to minimize the influence of the anisotropic properties on the fracture toughness along the depth of boride layers.

The effect of in-service work hardening and crystallographic orientation on the micro-scratch wear of Hadfield steel

This work presents the micro-scratch wear analysis of a sample of Hadfield steel previously used in a jaw crusher machine. The in-service work hardening material derived from dynamic high loads during the abrasive contact on the steel surface. The scratch resistance of hardened samples was evaluated by micro-scratch tests on a cross-section surface. Scratches were made on a deformed layer and on an undeformed material. In the undeformed region, the two crystallographic planes 001 and 111 were analyzed. The scratch tests were performed under various normal loads (from 20 mN to 250 mN) with a diamond cone stylus of 60° and a 5 μm radius. The electron microscopy techniques (FEG, FIB, and EBSD) were applied to characterize the microstructure, the wear micromechanisms, and the change of the submicrostructure due to scratches and crystallography. Additionally, an optical interferometry analysis was done for the topography characterization of the scratches. The microhardness profile analysis showed a variation of the hardness values from 300 to 700 HV0.3, which resulted from the twinned grains found near the worn surface. Low loads (20 mN and 50 mN) corresponded to mild wear regime, with a wear regime transition at 100 mN. A severe wear regime corresponded to higher loads (150 mN, 200 mN, and 250 mN). A significant variation of the friction coefficient along with the severely hardened layer for low normal loads was not observed. On the other hand, high loads resulted in significant variations of the friction coefficient, without correlation with microhardness profile. Additionally a strong relationship was observed between the scratch wear and the individual grain crystallographic orientation. For scratches in the (001) plane microploughing was established as the predominant wear micromechanism, whereas for (111) plane microcutting was identified as the micromechanism responsible for wear, presenting a higher friction coefficient than for the (001) plane.

Roughness analysis of composite based on aluminum alloys after electrical discharge machining process with use of different filtering methods

Ceramic materials or metallic materials containing ceramic phases are very interesting cases in roughness measurement. They are characterised by more or less pored surface. This paper presents roughness analysis of composite material with aluminum alloy base (AlSi7Mg) with 10 vol. % of silicon carbide (SiC) and 10 vol. % of spherical graphite (Cg) additions. Surfaces of these samples were prepared using electrical discharge machining (EDM) process. Measurements were performed with use of contact TOPO 02 profilometer equipped with diamond stylus tip (2 μm radius and 60 degree cone angle). This machine is produced in The Institute of Advanced Manufacturing Technology. Measurements were analysed with use of three filtration methods: Gaussian filter, Robust Gaussian filter and Gaussian filter for surfaces having stratified functional properties. Height roughness parameters, roughness core parameters and volume parameters were calculated. Most proper filtering method, which gives credible results of roughness parameters, was chosen.

Micro-scratching tests of a rolled aluminium alloy AA2024-T351 thick plate using a diamond micro-blade

The present research work is focused on investigating the apparent coefficient of abrasive friction of a rolled thick plate of an AA2024-T351 aluminium alloy, using micro-scratch tests. For this study, specific materials specimens and a particular UMT Micro-Scratch Equipment were used. The test involved the generation of a scratch process at a local scale using a diamond stylus (micro-blade defined by a radius of 0.8 μm) moving along a specified path under a constant normal force (10 N) and with a constant speed (0.2 mm/s). For the characterization of the surface quality, two orthogonal directions were considered: the longitudinal one, along the rolling direction, and the corresponding transversal one. Given the fractal nature of the surface, an investigation was done in order to assess its influence on the coefficient of abrasive friction. The fractal dimension Df, one of the most important parameters in a fractal surface analysis, was used to determine this influence in the global friction and abrasion phenomena. The abrasion factor was calculated using the Zum Gahr method for the data obtained with a specialized Mitutoyo SJ-301 surface tester. Measurements were made at the beginning, middle and at the end of the scratch channel. The obtained value for the abrasion factor was slightly less than zero. Other influences of anisotropic material features on global abrasion effects were also analyzed via comparisons of the coefficients of abrasive friction for both static and kinematic conditions.

Influence of third-body particles originating from bone void fillers on the wear of ultra-high-molecular-weight polyethylene.

Calcium sulfate bone void fillers are increasingly being used for dead space management in infected arthroplasty revision surgery. The presence of these materials as loose beads close to the bearing surfaces of joint replacements gives the potential for them to enter the joint becoming trapped between the articulating surfaces; the resulting damage to cobalt chrome counterfaces and the subsequent wear of ultra-high-molecular-weight polyethylene is unknown. In this study, third-body damage to cobalt chrome counterfaces was simulated using particles of the calcium sulfate bone void fillers Stimulan® (Biocomposites Ltd., Keele, UK) and Osteoset® (Wright Medical Technology, TN, USA) using a bespoke rig. Scratches on the cobalt chrome plates were quantified in terms of their density and mean lip height, and the damage caused by the bone void fillers was compared to that caused by particles of SmartSet GMV PMMA bone cement (DePuy Synthes, IN, USA). The surface damage from Stimulan® was below the resolution of the analysis technique used; SmartSet GMV caused 0.19 scratches/mm with a mean lip height of 0.03 µm; Osteoset® led to a significantly higher number (1.62 scratches/mm) of scratches with a higher mean lip height (0.04 µm). Wear tests of ultra-high-molecular-weight polyethylene were carried out in a six-station multi-axial pin on plate reciprocating rig against the damaged plates and compared to negative (highly polished) and positive control plates damaged with a diamond stylus (2 µm lip height). The wear of ultra-high-molecular-weight polyethylene was shown to be similar against the negative control plates and those damaged with third-body particles; there was a significantly higher (p < 0.001) rate of ultra-high-molecular-weight polyethylene wear against the positive control plates. This study showed that bone void fillers of similar composition can cause varying damage to cobalt chrome counterfaces. However, the lip heights of the scratches were not of sufficient magnitude to increase the wear of ultra-high-molecular-weight polyethylene above that of the negative controls.

Determining the viscoelastic behavior of polyester fiberglass composite by continuous micro-indentation and friction properties

The purpose of this study is to characterize the influence of specific micro-indentation test methods and frictional behavior on the viscoelastic properties of polyester fiberglass composite. Previous work shows that viscoelastic parameters for neat thermoset polymers can be successfully determined using a recently developed phenomenological model. In this study, similar depth sensing micro-indentation tests were performed on polyester fiberglass composite surface to determine the effect of fiberglass reinforcement on viscoelastic properties of the composite. Data obtained from micro-indentation tests was used to calculate the viscoelastic properties of the composite using the previously developed model, and compared to those of neat polyester. Results show that fiberglass significantly increased the both viscoelastic indentation modulus parameters, E0* and E1*, of the composite. Scratch tests were also performed on this composite, showing a higher coefficient of friction for a diamond stylus in contact with a polyester fiberglass composite than when in contact with a neat polyester. Moreover, the coefficient of friction decreased as the diamond stylus׳s sliding speed increased for the composite. A model is then applied to illustrate that the von Mises stress distribution in the material during a scratch test is dependent on scratch velocity.