Determination of stress concentration factors in porous materials

Boccaccını, Aldo R.; Ondracek, G.; Mombello, Enrique E.

doi:10.1007/bf00275423

Cited by 38 publications

(27 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Prior to crushing of the cenospheres in the syntactic foam, the epoxy matrix holds cenospheres in position and is the constituent to transfer the load, while the cenospheres carry the majority of the applied load. After the cenospheres are fractured, the load carried by the cenospheres is transferred to the neighboring matrix, and the pores left by the crushed cenospheres act as the stress risers …”

Section: Resultsmentioning

confidence: 99%

“…After the cenospheres are fractured, the load carried by the cenospheres is transferred to the neighboring matrix, and the pores left by the crushed cenospheres act as the stress risers. 36 The FE model in the previous work 4,12 predicted the stress distribution in the epoxy syntactic foams with different volume fractions of glass microballoons (refer to Figure 6). The top and bottom of the pore left by the crushed cenosphere are subjected to the highest tensile stress while the equator is under the maximum compressive stress.…”

Section: Effect Of the Cenosphere Volume Fraction On The Matrix Failurementioning

confidence: 99%

See 1 more Smart Citation

The 3D failure process in polymeric syntactic foams with different cenosphere volume fractions

Huang

Liu

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

The previous work (Huang and Li, Compos. Part B, 2015) proposed the failure mechanism in syntactic foams with low and high hollow microsphere volume fractions, based on the finite element simulation of localized stresses in the foam. In this work, in situ X‐ray microtomography of uniaxial compression tests was performed to provide the direct experimental evidence to the proposed mechanism by tracking the internal three‐dimensional failure process in epoxy syntactic foams with different cenosphere volume fractions (V). It was found that for both the low and high V, microcracks initiate in the matrix in the top and bottom of crushed cenospheres where the tensile stress concentrates, and then propagate longitudinally to become macrocracks. Increasing the cenosphere volume fraction also leads to the formation of matrix microcracks in the connection zone where the stress concentrates significantly; the matrix microcracks thus propagate diagonally and longitudinally in the high V foam. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47491.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Effect Of the Cenosphere Volume Fraction On The Matrix Failurementioning

confidence: 99%

The 3D failure process in polymeric syntactic foams with different cenosphere volume fractions

Huang

Liu

et al. 2019

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The experimental data indicate that the modulus and strength of laser‐processed Ti specimens can be tailored in the range of 2–45 GPa and 21–461 MPa, respectively, whereas the porosity was in the range of 35–42 vol %, close to those of human cortical bone. They also observed that it is possible to fabricate porous Ti samples with a porosity higher than 40 vol % that have appreciable mechanical properties, whereas in other literatures, it was reported that the strength of compacts with a porosity higher than 40 vol % is diminished to approximately 0 MPa . Generally, the important points in this process are good pore interconnectivity, control over porosity, and ability to realize complex shapes.…”

Section: Fabrication Techniques and Mechanical Behavior For Functionamentioning

confidence: 98%

“…They also observed that it is possible to fabricate porous Ti samples with a porosity higher than 40 vol % that have appreciable mechanical properties, whereas in other literatures, it was reported that the strength of compacts with a porosity higher than 40 vol % is diminished to approximately 0 MPa. 120,121 Generally, the important points in this process are good pore interconnectivity, control over porosity, and ability to realize complex shapes. However, this technique is limited to small pore sizes.…”

Section: Porous Fgm Dental Implantsmentioning

confidence: 99%

Dental implants from functionally graded materials

Mehrali

Shirazi

Mehrali

et al. 2013

J Biomedical Materials Res

115

View full text Add to dashboard Cite

Functionally graded material (FGM) is a heterogeneous composite material including a number of constituents that exhibit a compositional gradient from one surface of the material to the other subsequently, resulting in a material with continuously varying properties in the thickness direction. FGMs are gaining attention for biomedical applications, especially for implants, owing to their reported superior composition. Dental implants can be functionally graded to create an optimized mechanical behavior and achieve the intended biocompatibility and osseointegration improvement. This review presents a comprehensive summary of biomaterials and manufacturing techniques researchers employ throughout the world. Generally, FGM and FGM porous biomaterials are more difficult to fabricate than uniform or homogenous biomaterials. Therefore, our discussion is intended to give the readers about successful and obstacles fabrication of FGM and porous FGM in dental implants that will bring state-of-the-art technology to the bedside and develop quality of life and present standards of care.

show abstract

“…As a general case, a foam can be approximated by a homogeneous distribution of spherical gas cells inside a polymer matrix. Using this analogy, Boccaccini et al [22] showed that the simple square power-law [4][5][6] defined by:…”

Section: Flexural Modulusmentioning

confidence: 99%

Using Density Profiles to Predict the Flexural Modulus of Structural Polymer Foams

Rodrigue

2008

Journal of Cellular Plastics

View full text Add to dashboard Cite

Recently, the author presented a simple equation to approximate the density profile inside a symmetric structural polymer foam (Rodrigue, D. (2007)). This equation, based on a generalized Fourier series approximation, is now used to predict the apparent flexural modulus of these foams. The calculations are compared with data taken from the literature and the results show that this new model can predict with very high precision (maximum 2% deviation) the data under the range of conditions available.

show abstract

Determination of stress concentration factors in porous materials

Cited by 38 publications

References 8 publications

The 3D failure process in polymeric syntactic foams with different cenosphere volume fractions

The 3D failure process in polymeric syntactic foams with different cenosphere volume fractions

Dental implants from functionally graded materials

Using Density Profiles to Predict the Flexural Modulus of Structural Polymer Foams

Contact Info

Product

Resources

About