摘要:
A displacement measurement system enables accurate and easy measurement of the maximum displacement formed on plates which are used for military or civil purposes, especially in vehicle manufacture, and which are subjected to a blast or crash test.
摘要:
The disclosure relates to an extensometer wherein the actuation of the contact arms is performed by a separate rotating bar so as to avoid or minimize placing active mechanics onto the arms. The rotating bar includes a spool about which a metal belt is wound. Rotating the bar, and hence the spool, in the desired direction pulls the metal belt which pulls a spring-loaded wedge with internal camming slots which urges the contact arms apart.
摘要:
The invention relates to a method for counting events occurring during a period T carried out by a mechanical counter comprising two toothed wheels with the same pitch, the occurrence of an event causing the rotation of each wheel by an angle corresponding to the pitch of the teeth thereof, said method comprising: a first step of counting or calculating, for each wheel at the end of T, the difference in the number of teeth between the initial and final position thereof, said step being at least partially carried out either by optical means, requiring the presence on each wheel of at least one marker, or by means for measuring the angular displacement of each wheel and associated calculation means; and a second step of calculating the number of occurred events N in accordance with the difference between the values counted or measured and in accordance with the number of teeth of the wheels.
摘要:
The disclosed embodiment is an extensometer to measure transverse strain with a passive vertical system making use of a linear optical encoder. The sensor arms are mounted on respective carriages which traverse on respective linear tracks. The carriages are spring-loaded so as to bias the sensor arms toward a closing direction. In order to separate the sensor arms and act against the force of the springs, the carriages are responsive to or pushed by upper and lower drive brackets which are affixed to respective upper and lower portions of a looped timing belt. The extensometer makes use of a low-friction design to minimize rolling friction in the movement of the two sensor arms. One carriage includes an encoder read-head which directly faces an encoder scale on the other carriage. In this configuration, the exact relative position of the two carriages, and hence the two sensor arms, can be read.
摘要:
A method for designing and manufacturing micro reinforced concrete that produces a composite material that shares physical properties with both the reinforcing material and the concrete. Micro reinforced concrete is a two-part system that made of micro reinforcements, which are twisted steel fibers, and a concrete matrix. The micro reinforcements are added at a specified dose to an ordinary concrete matrix to create the micro reinforced concrete.
摘要:
The invention relates to a micro-sensor comprising: a substrate comprising a first portion and a second portion; a third portion and fourth portion provided between said portions and connected to the first portion and the second portion respectively by an elastic member; detection and counting means comprising: a counting gear, a third beam capable of meshing with the gear, means for amplifying the value of a relative movement between said portions and comprising: a first beam attached at one end thereof to the third portion and at the other end thereof to a plate, a second beam attached at one end thereof to the fourth portion and at the other end thereof to said plate, the third beam being attached on one side to the plate and comprising a tooth capable of meshing with said gear.
摘要:
Dargestellt und beschrieben sind ein Verfahren zur Messung von Dehnungen, insbesondere von plastischen Dehnungen von Rohrleitungen (1), umfassend die folgenden Schritte: - Aufbringen von wenigstens zwei Messkörpern (2) auf eine Messoberfläche (3), - Durchführen einer Nullmessung, - Durchführen wenigstens einer Wiederholungsmessung, und - Vergleichen der Messwerte zur Bestimmung eines Dehnungswertes sowie ein Messkörper zur Verwendung in einem solchen Verfahren. Damit eine kostengünstige und präzise Messung von plastischen Dehnungen an Hochtemperaturbauteilen ermöglicht wird, ist vorgesehen, dass die Nullmessung und die Wiederholungsmessungen mit einem berührenden Messverfahren erfolgen. Dazu weist jeder Messkörper (2) eine Zentrierbohrung (5), insbesondere eine kegelförmige Zentrierbohrung, auf.