Absolute Dehnungsmessung per Smart Sensor/Absolute strain measuring Smart Sensor

2020 ◽  
Vol 110 (11-12) ◽  
pp. 763-767
Author(s):  
Mark P. Sanders ◽  
Jonas Schulz ◽  
Ralf Wunderlich ◽  
Philipp Dahlem ◽  
Robert H. Schmitt

Dehnmessstreifen werden meist eingesetzt, um kurzfristige kraft- und momentenabhängige Dehnungen zu messen. Die thermische Dehnung des Bauteils lässt sich dabei typischerweise nicht zuverlässig messen, da sich der Dehnmessstreifen unter Temperatur ebenfalls verformt. Der hier beschriebene Smart Sensor soll für absolute Verformungsmessung jedoch entsprechend die absolute Dehnung messen, das heißt sowohl mechanische als auch thermische Dehnung. Dieser Beitrag beschreibt den Aufbau und die Validierung eines kostengünstig herstellbaren Bluetooth-Dehnungssensors, bei dem als temperaturinvariante Referenz ein Bauteil aus kohlefaserverstärktem Kunststoff genutzt wird. Strain gauges are mostly used to measure short-term force and torque-dependent strain. Thereby the thermal strain of the component is mostly a disturbing effect. The following Smart Sensor is explicitly intended to measure the absolute strain for absolute deformation measurements. The article describes the design and validation of a bluetooth strain sensor that can be manufactured at low cost using a carbon fiber reinforced plastic component as a temperature-invariant reference.

2013 ◽  
Vol 351-352 ◽  
pp. 1532-1536 ◽  
Author(s):  
Bin Ding ◽  
Li Jun Ouyang ◽  
Zhou Dao Lu ◽  
Wei Zhen Chen

BFRP has excellent strength, durability, thermal properties and economic cost. To test seismic performance of short columns strengthened with BFRP. Low cyclic loading test was conducted on one comparative short column and two RC short columns strengthened with BFRP. The test shows that short columns warped by BFRP show excellent failure modes, shear capacity, ductility and energy dissipation. As a new fiber reinforced plastic, BFRP has a good prospect in the area of seismic strengthening for its low cost and comprehensive mechanical properties.


2021 ◽  
Vol 2021 (3) ◽  
pp. 4721-4725
Author(s):  
T. H. Lee ◽  
◽  
H. Gim ◽  
S. Oh ◽  
T. Gotthardt ◽  
...  

Linear scale has significant impacts on the machine tool accuracy, since the positioning of the linear axes are controlled by its measurement. This paper presents a novel concept of linear scale design which can provide high thermal stability with low cost. This concept applies two different materials: a steel linear scale attached mechanically on a carbon fiber reinforced plastic (CFRP) tube. Attaching this two materials, the thermal behavior of the steel scale can be mechanically compensated by the CFRP tube when the temperature changes. The potential of the design concept is analyzed based on the experiment results.


2013 ◽  
Vol 7 (1) ◽  
pp. 127-135 ◽  
Author(s):  
E. Grande ◽  
M. Imbimbo ◽  
A. Rasulo

The paper discusses the results of an experimental investigation carried out on reinforced concrete (RC) beams strengthened in shear by externally bonded fiber reinforced plastic (FRP) sheets. The study is devoted to analyze the role that the transverse steel reinforcement and the beam slenderness ratio could play on the resistant mechanism of RC beams strengthened in shear by FRP composites. The results are summarized and analyzed in detail in the paper in terms of shear capacity, cracking pattern and shear resisting contribution of FRP.


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