Untersuchungsstrategie zur Bewertung der Langzeitstabilität von Dehnungsmessstreifen

Abstract

Test strategy for evaluation of strain gauge long term stability In the field of structural health monitoring the measuring of strain is prevalent beside temperature and displacement. The strain is used to determine the utilization rate and to estimate the fatigue strength of a structure. A very common measurement method for strains at and in components is the usage of strain gauges. Further, a climate cycle for analysis of long term stability of strain gauges is introduced, that simulates an accelerated temperature and humidity stress. This cycle consists of four phases, which lasts 240 h and covers different combinations of temperature and humidity conditions up to freezing and thawing. The results of a 85 d lasting long term test are presented and used to describe characteristic values for long term stability of strain gauges. The measurement results show significant differences for the strain gauge types in the zero point drift and underline the role of correct choice and protection to achieve reliable strain measurements.

Crack monitoring on concrete structures: Comparison of various distributed fiber optic sensors with digital image correlation method

“…In digital twins, structural health monitoring (SHM) [5][6][7][8] serves as the most important link between the real object and its virtual representation, allowing structures to be monitored in near real time and also a prediction of their condition can be made. 9,10 Measurement errors 11 and influences from aging measurement systems 12 can negatively affect the quality of the monitoring data and must therefore be corrected automatically.…”

Zusätzliche Schienenspannungen aus Langzeitverformungen von Eisenbahnbrücken mit Fester Fahrbahn – Modell und Realität

“…Deshalb tragen neben der Wahl des Sensors auch die Wahl des Schutzsystems sowie die Qualität der Installation maßgeblich zur Langzeitstabilität der Messstelle bei. Um den hohen Anforderungen beim hier vorgestellten Schienenmonitoring gerecht zu werden, wurden im Vorfeld Eignungsnachweise am Gesamtsensoraufbau durchgeführt . In Bild ist der Zustand von ungeeigneten Schutzsystemen nach Durchführung eines Versuchs im Klimasimulationsschrank abgebildet.…”

Applications of electrical strain gages in the fields of monitoring and material mechanics

“…This cycle consists of temperature and humidity changes (see Figure ). The complete test lasts up to 1500 h. Basics to the method of the performed long‐term stability tests are given by Herrmann et al…”

“…This cycle consists of temperature and humidity changes (see Figure 17). The complete test lasts up to 1500 h. Basics to the method of the performed long-term stability tests are given by Herrmann et al [9] The results describe characteristic values for long-term stability of strain gages. The measurement results show significant differences between the strain gage types regarding the zero-point drift and underline the role of correct choice and protection to achieve reliable strain measurements.…”