摘要:
Máquina de ensayo (1) para determinar la altura de rebote de un balón, que comprende un brazo (2) que está articulado a un accionador motorizado ubicado en una carcasa (3), tal que el brazo (2) presenta un punto de giro que describe una trayectoria circular, incluyendo el brazo (2) un medio de sujeción previsto para sujetar de forma fija un balón, una placa electrónica configurada para detectar un ángulo α definido por el brazo (2) y la superficie sobre la cual rebotar el balón tras una acción de rebote del balón sobre dicha superficie, siendo la carcasa (3) movible por medios de desplazamiento previstos para desplazarse sobre una superficie. Esta máquina está prevista para determinar la altura de rebote de un balón, por ejemplo, un balón de fútbol sobre una superficie de césped artificial de una forma automatizada, por lo que se elimina el factor humano durante la realización del ensayo.
摘要:
A method and apparatus for determining the compressive strength of masonry units based on airborne sonic signals generated by stimulating the samples with short duration, mechanical impulses are described. The non-destructive testing apparatus consists of a specimen support unit which mechanically isolates the masonry unit from the environment and from the support, a mechanical stimulator, and an acoustic response detector. The signals recorded are analyzed to extract the pertinent features which are then used to compute the compressive strength of the sample. The pertinent signals are deduced through a calibration of the masonry type being analyzed (material and shape) based on physical analysis of the sample's normal modes of vibration, or through Finite Element Analysis of the vibrations, or through direct empirical calibration. This non-destructive testing method is low-cost, readily implemented and provides a reliable technique for compressive strength estimation.
摘要:
Methods are provided that facilitate the selection of a film structure for use in a package. In one aspect, a method of selecting a film structure for use in a package comprises determining a critical impact direction of a package by finite elemental method (FEM) analysis, wherein the package has a predetermined volume, a predetermined shape, and a predetermined fill material; determining one or more desired tensile properties of a film structure to use in the package based on the critical impact direction, wherein the one or more desired tensile properties comprise at least one of toughness in the machine direction, toughness in the cross direction, elongation at break in the machine direction, elongation at break in the cross direction, stress at break in the machine direction, and stress at break in the cross direction; and selecting a film structure based on the one or more desired tensile properties.
摘要:
An impact penetration resistant laminate comprises a plurality of alternating layers of (i) non-fibrous ultra-high molecular weight polyethylene monolayers and (ii) a thermoplastic adhesive, the adhesive having a basis weight of no greater than 5 gsm and a zero-shear-rate viscosity, determined from an oscillating disc rheometer in a frequency sweep between 0.1 rad/s and 100 rad/s, conducted per ASTM D 4440 at 125°C, and calculated from fitting to a Carrea-Yasuda four parameter model, of at least 1500 Pa-s, wherein (a) at least 90 percent of the monolayers are arranged such that the orientation of one monolayer is offset with respect to the orientation of an adjacent monolayer, and (b) the modulus of elasticity through the thickness of the laminate is at least 3 GPa.
摘要:
A personal ballistic protection device incorporates multiple removable test coupons. Each of the test coupons are retained with the ballistic device during its use until each coupon is removed for test purposes. Each test coupon has a construction identical to the protective portions of the ballistic device and is removable and configured to allow for destructive testing. Sufficient coupons are provided with the ballistic protection device to allow for periodic testing over a predetermined useful life of the ballistic protection device. One embodiment of the device is a body armor vest.
摘要:
Embodiments are directed to strengthened glass articles comprising a thickness t ≤1 mm (1000 μm), an inner region under a central tension CT (in MPa), and at least one compressive stress layer adjacent the inner region and extending within the strengthened glass article from a surface of the strengthened glass article to a depth of layer DOL (in μm), wherein the strengthened glass article is under a compressive stress at the surface CSS (in MPa), wherein the strengthened glass article is an alkali aluminosilicate glass article comprising 0-5 mol% Li 2 O, and at least 3 mol % AI 2 O 3 , and wherein the DOL ≥ 90 μm, and a CS s /DOL ratio ≥ 2.5 MPa/μm.
摘要翻译:实施例涉及包括厚度t≤1mm(1000μm),中心张力CT下的内部区域(以MPa为单位)的加强玻璃制品和邻近内部区域并在加强玻璃制品内延伸的至少一个压缩应力层 从所述强化玻璃制品的表面到DOL层的深度(μm),其中所述强化玻璃制品在表面CSS处的压缩应力(MPa),其中所述强化玻璃制品是碱性铝硅酸盐玻璃制品,其包含 0-5摩尔%Li 2 O和至少3摩尔%Al 2 O 3,并且其中DOL≥90μm,CSs / DOL比≥2.5MPa/μm。
摘要:
An electronic method for matching a user with a golf ball includes playing a first digital audio file to a user via a computer and playing a second digital audio file to the user via the computer. Each of the first digital audio file and the second digital audio file correspond to an acoustic response of a respective golf ball to a standardized impact force. The method then includes receiving an input from the user via the computer, where the input corresponds to a preferred acoustic response selected from the acoustic response of the first golf ball and the acoustic response of the second golf ball. Once the preferred response is determined, the method includes displaying a golf ball model that corresponds to the preferred acoustic response.
摘要:
An improved device (10) for simulating gravel impact damage on panels (40), such as protected and unprotected areas of painted vehicle panels, is disclosed. The gravel impact damage simulator (10) includes an enclosure (12), a gravel inlet port having an extension spout (22), a motor-driven rotatable impeller (30) below the inlet port, a downwardly angled baffle (24) between the inlet port and the impeller (30), and a test panel slot (20) through which a test panel (40) may be inserted into the enclosure (12). During operation, gravel is introduced through the extension spout (22) and inlet port. The gravel drops into the angled baffle (24), where it is directed toward the rotating impeller (30). The rotating impeller (30) strikes the gravel and projects it toward the test panel (40).