Optical 3-dimensional measurements on a FRP beam tested at serviceability limit

Philippe, Caperan; Poljanšek, Martin; Gutiérrez, Eugenio; Primi, Stefano; Paulotto, Carlo

doi:10.1016/j.compstruct.2011.10.022

Cited by 8 publications

(3 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For what concerns the optical analysis of the high-speed photo sequence, two different algorithms have been applied: a fast computational tracking algorithm and a full field procedure, called the optical flow method. The fast computational tracking algorithm [ 20 ] exploits the black and white Gaussian targets mentioned before and allows the accurate evaluation of target displacements with an accuracy of about 1 µm (for an image pixel dimension equal to about 0.1 mm) with very low computational costs. Data produced with this numerical procedure can be directly compared to the data obtained from the Hopkinson bar analysis of the strain-gage measurements in order to assess the effectiveness of proposed elaboration.…”

Section: Modified Hopkinson Pressure Bar For Soft Materials (Mhpb-mentioning

confidence: 99%

Development of a Hopkinson Bar Apparatus for Testing Soft Materials: Application to a Closed-Cell Aluminum Foam

Peroni

Solomos

Babcsán³

2016

Materials

View full text Add to dashboard Cite

An increasing interest in lightweight metallic foams for automotive, aerospace, and other applications has been observed in recent years. This is mainly due to the weight reduction that can be achieved using foams and for their mechanical energy absorption and acoustic damping capabilities. An accurate knowledge of the mechanical behavior of these materials, especially under dynamic loadings, is thus necessary. Unfortunately, metal foams and in general “soft” materials exhibit a series of peculiarities that make difficult the adoption of standard testing techniques for their high strain-rate characterization. This paper presents an innovative apparatus, where high strain-rate tests of metal foams or other soft materials can be performed by exploiting the operating principle of the Hopkinson bar methods. Using the pre-stress method to generate directly a long compression pulse (compared with traditional SHPB), a displacement of about 20 mm can be applied to the specimen with a single propagating wave, suitable for evaluating the whole stress-strain curve of medium-sized cell foams (pores of about 1–2 mm). The potential of this testing rig is shown in the characterization of a closed-cell aluminum foam, where all the above features are amply demonstrated.

show abstract

Section: Modified Hopkinson Pressure Bar For Soft Materials (Mhpb-mentioning

confidence: 99%

Development of a Hopkinson Bar Apparatus for Testing Soft Materials: Application to a Closed-Cell Aluminum Foam

Peroni

Solomos

Babcsán³

2016

Materials

View full text Add to dashboard Cite

show abstract

“…In other cases, e.g. [4,5], the alternative strategy has been used of FRP beams connected to overhead concrete slabs, so that the FRP and concrete carry tension and compression, respectively, from global bending, in alignment with the complementary stress resisting capabilities of the materials.…”

mentioning

confidence: 99%

Bi-axial behaviours of abraded and rehabilitated FRP decks as anisotropic plates under concentrated wheel loading

Sebastian

2021

Engineering Structures

View full text Add to dashboard Cite

“…• a fast tracking algorithm [3] that returns an accurate measure (in the order of 0.01 mm) of the position of the particular Gaussian grayscale targets applied to the column and to the impacting mass (Fig. 9); • a full-field technique, the so called optical flow algorithm [4], that returns the displacement of each image pixel (with less precision compared with the previous algorithm), useful to study the evolution of the fracture paths during the test.…”

Section: -P3 Epj Web Of Conferencesmentioning

confidence: 99%

Assessment of dynamic mechanical behaviour of reinforced concrete beams using a blast simulator

Peroni

Solomos

Caverzan

et al. 2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. Critical infrastructures may become the target of terrorist bombing attacks or may have to withstand explosive loads due to accidents. The impulsive load connected to explosions is delivered to the structure in a few milliseconds forcing it to respond or fail in a peculiar mode. With reference to the above scientific framework this work presents an innovative apparatus designed and developed at the European Laboratory for Structural Assessment to reproduce a blast pressure history without using explosives. This apparatus is practically a hybrid nitrogen-spring-driven actuator that accelerates masses of up to 100 kg to a maximum velocity of about 25 m/s that impact against the tested structure. The pressure-load history applied to the structure is modulated and reshaped using appropriate layers of elastic soft materials (such as polymeric foams) placed between the specimen and the impacting masses. Specific instrumentation has extensively been utilised to investigate the blast simulator performance and to precisely measure the pressure loads applied to the specimen. A series of tests on real scale reinforced concrete beams/columns (250 × 250 × 2200 mm) has been performed to efficiently assess the performance and potentiality of the new blast simulator. Results are under evaluation. In addition to the experimental work, a series of numerical simulations by means of the explicit FEM code EUROPLEXUS have been carried out to support and improve the equipment design.

show abstract

Optical 3-dimensional measurements on a FRP beam tested at serviceability limit

Cited by 8 publications

References 2 publications

Development of a Hopkinson Bar Apparatus for Testing Soft Materials: Application to a Closed-Cell Aluminum Foam

Development of a Hopkinson Bar Apparatus for Testing Soft Materials: Application to a Closed-Cell Aluminum Foam

Bi-axial behaviours of abraded and rehabilitated FRP decks as anisotropic plates under concentrated wheel loading

Assessment of dynamic mechanical behaviour of reinforced concrete beams using a blast simulator

Contact Info

Product

Resources

About