A Novel Method for Strain Controlled Tests

Olmi, Giorgio

doi:10.1007/s11340-011-9496-x

Cited by 15 publications

(7 citation statements)

References 37 publications

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“…All the values are generally within few percentage points with the exception of CC 12 , which is about 15%, indicating that the first channel is slightly sensitive to the second force component, as mentioned above. Computing the matrix of the coupling coefficients, students had the opportunity to quantify the impact of secondary effects on the cell decoupling and to learn a tool to compare cells based on their level of decoupling.…”

Section: A Load Cell For the Simultaneous Measurement Of Three Forcessupporting

confidence: 51%

“…5 -7 Other contributions are regarding sailing 8 or, beyond specific sport applications, the dynamic response of structures under wind 9,10 and the development and checking of testing devices for the mechanics of materials lab experimentation. 11,12 Further interesting applications are in the field of vehicle engineering. Strain gage load cells were used in Refs.…”

Section: Introductionmentioning

confidence: 99%

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Load Cell Training for the Students of Experimental Stress Analysis

Olmi

2016

Exp Tech

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Many numerical models are nowadays available for the structural analysis of complexly shaped structures. However, a critical problem consists of the estimation of the actual loads that a structure withstands. The most proper way to determine them under service conditions consists of executing in-field tests, where load cells have an important role. This article deals with a didactic project at the University of Bologna, focused on the development of strain gage load cells, from design to calibration and use. Details are provided on the course units involved and on the levels of teaching, and three case studies are presented. Two case studies deal with the design of decoupled load cells, using simple beam geometry. Students had the opportunity to become confident with the principles of mechanics and to tackle the not trivial activities like calibration by decoupled load application and determination of the related matrices. The third one deals with the development of a load cell for impact loads, where the students had the chance to observe a practical application of the studied Wheatstone bridge connection, to participate in on-field tests, and to better understand the close relationship between experimentation and design.

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Section: A Load Cell For the Simultaneous Measurement Of Three Forcessupporting

confidence: 51%

Section: Introductionmentioning

confidence: 99%

Load Cell Training for the Students of Experimental Stress Analysis

Olmi

2016

Exp Tech

Self Cite

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“…Strain gauges were connected to form two quarter Wheatstone bridges by three-wire connection. The decision of making use of strain gauges is supported by many papers in literature [5][6][7][8][9][10][11][12][13][14][15][16], dealing with on fields tests by instrumented components or specifically developed load cells. Especially in the case of dynamic loads, the execution of tests in the field is often the only option to get a reliable estimation [6-7, 9, 11, 13, 16].…”

Section: Methodsmentioning

confidence: 99%

Failure of the chassis of roller skates for agonistic figure skating

Olmi

2015

Case Studies in Engineering Failure Analysis

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The subject of this work was to investigate the early failure, which occurred in the chassis of a roller skate for figure skating. The paper deals with the preliminary analysis of the crack and with the integrated approach, which had to be followed to overcome the problem. Literature in the fields of physiology and biomechanics was studied to correctly simulate the load distribution on the chassis. Finite element simulation, experimental stress analysis and analytical modeling of impact phenomena had to be combined together to estimate the entity of dynamic loads and the corresponding state of stress. The analysis led to the determination of the primary cause of failure, bending fatigue, and to the suggestion of a simple solution to improve and optimize the project.

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“…Many contributions in literature proved that performing in-field tests, usually with strain gage equipment, is often the only way to reliably determine the states of stress and strain in the operation conditions. [19][20][21][22][23][24][25][26][27][28] The rotating ring has been suitably instrumented by electrical strain gages, bonded at the sections where the concentrated loads are applied. In particular, four strain gages (CEA-XX-125-UW-120, Manufacturer: Vishay, Malvern, PA, USA) have been used and aligned along the tangential direction of the ring: their collocations in the ring cross section are shown in Figure 14(a) and (b).…”

Section: Experimental Validationmentioning

confidence: 99%

A user-friendly computational algorithm for the structural analysis of wrapping machine rotating rings

Croccolo

Agostinis

Fini

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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Wrapping machines usually consist of a two-or a four-column frame, supporting a huge rotating ring, connected to a prestretch unit with film coil carrier. Stiffness is a key point of packaging machines, since it is strictly related to the accuracy of the wrapping task. It depends on the stiffness of the frame, which can be achieved by the four-column architecture, and on the ring constraint system. As a consequence, the ring structures are usually highly statically indeterminate. Nowadays, there is an increasing demand for higher rotational speeds and more reduced operation times. Therefore, an accurate structural analysis of the ring, considering its actual loading and constraints is more and more important. The structural analysis of the rotating ring is treated by many references; however, such a statically indeterminate constraining makes this problem highly complicated. The goal of this paper consists in the development of a general and original computational algorithm for the structural analysis of rotating rings. The results are collected in a user-friendly way in terms of normalized internal loads, so that they can be of a great help even for not expert users. This model has been experimentally validated and easily applied to case studies and optimization tasks.

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A Novel Method for Strain Controlled Tests

Cited by 15 publications

References 37 publications

Load Cell Training for the Students of Experimental Stress Analysis

Load Cell Training for the Students of Experimental Stress Analysis

Failure of the chassis of roller skates for agonistic figure skating

A user-friendly computational algorithm for the structural analysis of wrapping machine rotating rings

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