MS&T, the annual materials science conference held by four technical societies, offers an unreplicated technical program addressing structure, properties, processing and performance across the materials community. The exposition showcases a wide variety of equipment and services to the automotive, aerospace, instrumentation, medical, oilfield and energy industries. Learn more about each society here.
Honeycomb Panel Wear Resistance Using Tribometer
In the honeycomb sandwich structure, the honeycomb core mainly carries the shear stresses whereas the faceplates carry the bending stresses. The faceplates also act as a protective layer against aggressive environments and as a thermal, water vapor and sound barrier. Therefore, mechanical and tribological properties of the faceplates are critical for the service life and quality of the honeycomb panel. The faceplates can be manufactured using different materials, such as glass or carbon fiber-reinforced thermoplastics, thermoset polymers and sheet metals. Their distinct mechanical characteristics contribute to their varied wear behaviors. It is valuable to develop a simple wear test for evaluating the honeycomb panel wear resistance.
Honeycomb Panel Finish Measurement Using 3D Profilometry
Roughness, porosity and texture of the honeycomb panel finish is critical in the final product quality. It communicates aesthetic and functional characteristics and product quality. A better understanding of the surface texture and porosity allows optimizing the processing and control measures. Quantitative, precise and reliable surface inspection of the honeycomb panel is in need to control surface parameters for application and painting requirements. The Nanovea 3D Non-Contact Profilometers utilizes chromatic confocal technology with unique capability to precisely measure the sample surface.
Mechanical Behavior of Honeycomb Using Macroindentation
The strength of honeycomb panels depends on several factors, such as the panel size, facing material and the density of the honeycomb cells within it. Mechanical behavior of honeycomb structure is a key factor in manufacturing failure free product. Different ASTM standards have been developed to evaluate the overall compressive strength and tensile strength of panels, lamination strength of bond between facings and core of sandwich structure, as well as beam coefficients, such as bending stiffness, deflection and facing stress. In aerospace industry where the honeycomb panels are most widely used, mechanical structure of minimal weight and excellent strength and durability is desirable. The thinner vertical walls in the core and facing fiber-reinforced plastic sheets demand high-precision local mechanical integrity inspection. Indentation is widely applied to measure the mechanical behaviors of materials at small scalesi. In order to accurately evaluate the local mechanical properties of the honeycomb structure, indentation location control of high precision is critical.
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Controlled Humidity Nanoindentation of Polymer Films
The mechanical properties of polymer is modified as the environmental humidity elevates. Transient moisture effects, a.k.a. mechano-sorptive effects arises as the polymer absorbs high moisture content and experiences accelerated creep behavior. The higher creep compliance is a result of complex combined effects such as increased molecular mobility, sorption-induced physical aging and sorption-induced stress gradients.
Therefore, a reliable and quantitative test (Humidity Nanoindentation)of the sorption-induced influence on the mechanical behavior of polymeric materials at different moisture level is in need. The Nano module of the Nanovea Mechanical Tester applies the load by a high-precision piezo and directly measures the evolution of force and displacement. Uniform humidity is created surrounding the indentation tip and the sample surface by an isolation enclosure, which ensures measurement accuracy and minimizes the influence of drift caused by humidity gradient.
Humidity Effect On Paper Flatness
Paper flatness is critical to the proper performance of printing paper. It communicates functional characteristics and makes an impression of the paper quality. A better understanding of the effect of humidity on paper flatness, texture and consistency allows optimizing the processing and control measures to obtain the best product. Quantifiable, precise and reliable surface inspection of the paper in different humid environments is in need to simulate the use of paper in the realistic application. The Nanovea 3D Non-Contact Profilometers utilizes chromatic confocal technology with unique capability to precisely measure the paper surface. A humidity controller provides precise control of the humidity in a sealed chamber where the test sample is exposed to the moisture.
Humidity Tribology Effect On DLC Coating
The DLC coating exhibits very low COF against steel ball (below 0.1) under high vacuum and dry condition. However, it has also been reported that the DLC is very sensitive to the change of environmental conditions, particularly the relative humidity tribology(RH). The environment with a high humidity and oxygen concentration may lead to significant increase of the COF. In order to simulate the realistic environmental conditions of the DLC coating for tribological applications, reliable wear evaluation in a controlled and monitored humidity is in need. It allows users to properly compare the wear behaviors of the DLC coatings exposed to different humidity and to select the best candidate for the targeted application.
Cutting Tool Edge Measurement in Seconds
Irvine CA, July 27, 2016 – Conventional profilometry scans sample surfaces from a single, fixed direction. This is only appropriate for measuring sufficiently flat samples, as opposed to cylindrical shapes that require a precise 360° rotation. For an application such as characterizing the helical cutting edge of a tool, a conventional machine would need multiple scans from different angles of the entire part, as well as significant post scan data manipulation. This is often too time consuming for QC applications that only require measurements from very specific regions.
NANOVEA’S rotational stage solves this problem with simultaneous motion control of the lateral and rotational axes. This technique eliminates the time consuming need of measuring the entire part and continuous realignment. Instead, the full circumference of the entire cutting edge can be determined in seconds. All desired angles and features can be directly determined from the scan, with no need for the extensive stitching together of multiple files.
NANOVEA’s chromatic confocal technique offers far greater resolution, down to 2.7 nm, and accuracy than Focus Variation competitors. The raw surface height is measured directly from the detection of the wavelength focused on the surface, with none of the errors caused by Interferometry techniques, no field of view limitations, and no need for sample surface preparation. Materials with extremely high or low reflectivity can easily be measured and very high wall angles are accurately characterized without any issue.
Coupled with NANOVEA’s line sensor, a bar of data up to 4.78mm wide can be captured in a single pass, while moving linearly for up to 150mm in the scanning direction. Simultaneously, the rotational stage can revolve the sample at the desired speed. Put together, this system allows for the creation of a continuous 3D height map of the entire circumference of a cutting edge, with any pitch or radius, in a fraction of the time when compared to other technologies.
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Polymer Morphology by Heat Deformation
Surface deformation of materials induced by environmental elements such as temperature, humidity and corrosion is vital to its service quality and functionality. Accurate 3D polymer morphology measurement allows quantifying the physical deformations of the surface form, roughness, volume/area, etc. Surfaces prone to deformation due to contact wear, high heat and others need regular inspection to ensure performance reliability.
Teflon Mechanical Properties at High Temperature
At elevated temperatures, heat changes teflon mechanical properties such as the hardness and viscoelasticity, which may result in mechanical failures. A reliable measurement of the thermo-mechanical behavior of polymeric materials is in need to quantitatively evaluate the candidate materials for high temperature applications. The Nano module of the Nanovea Mechanical Tester studies the Hardness, Young’s Modulus and Creep by applying the load with a high-precision piezo and measuring the evolution of force and displacement. An advanced oven creates a uniform temperature surrounding the indentation tip and the sample surface throughout the nanoindentation test so as to minimize the effect of thermal drift.