New fracture characterization in polymer miniature specimens based on the essential work of fracture

Cuesta, I.I.; Alegre, J.M.

doi:10.1002/app.42837

Cited by 4 publications

(8 citation statements)

References 21 publications

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“…There are two cases: For DDEN‐T specimens, when

L = 0

, the load–displacement curve approaches zero (

W_{f} = 0

), since the specimen is separated into two halves and the force during the test is zero. However, for P‐SPT specimens, if

L_{eff} = 0

, the load–displacement curve does not approach zero (Figure ), as the punch must plastically deform the two specimen halves in order to pass through them to complete the test …”

Section: Resultsmentioning

confidence: 99%

“…Thus, as a function of the ligament length

L

, the specific work of fracture

w_{f}

can be plotted using eq. , where

w_{e}

and

β \cdot w_{p}

can be determined by intercept with the

w_{f}

axis for

L = 0

and the slope obtained by its linear regression …”

Section: Materials and Test Rate Effect For Standard Specimensmentioning

confidence: 99%

“…The SPT specimens were tested once the pre‐notch was achieved. The tests were conducted at room temperature using a punch diameter of

d_{p} = 2.5 mm

and the hole in the lower die had a diameter of

D_{d} = 4 mm

and a fillet radius of

r = 0.5 mm

(Figure ) . For the selection of the two test rates used in this research, the rate usually employed in the SPT was taken into account.…”

Section: Ewf For Pre‐notched Spt Specimensmentioning

confidence: 99%

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Analysis of the effect of the test rate on polymer essential work of fracture parameters for the small punch test

Cuesta¹,

Alegre²

2016

J of Applied Polymer Sci

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In recent decades, one of the non-standard tests that has been consolidated as a viable alternative in those cases where there is not sufficient material to carry out standard tests is the small punch test. This test basically consists of deforming a miniature specimen using a high strength punch. It is possible for this miniature specimen to have an initial pre-notch with the aim of improving the fracture behavior estimation of the material analyzed. Recently, to characterize the fracture properties of polymer sheets under plane stress conditions, there has been an attempt to establish the feasibility of applying the essential work of fracture (EWF) method in polymer pre-notched miniature specimens. This article intends to go one step beyond and focuses on the test rate, which is an important aspect in the EWF application. Its effect on the EWF parameters in polymer pre-notched miniature specimens has been analyzed and its correlation has been established with the results obtained from standard specimens. V C 2016 Wiley Periodicals, Inc. J.Appl. Polym. Sci. 2016, 133, 43314.

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“…There are two cases: For DDEN‐T specimens, when

L = 0

, the load–displacement curve approaches zero (

W_{f} = 0

), since the specimen is separated into two halves and the force during the test is zero. However, for P‐SPT specimens, if

L_{eff} = 0

, the load–displacement curve does not approach zero (Figure ), as the punch must plastically deform the two specimen halves in order to pass through them to complete the test …”

Section: Resultsmentioning

confidence: 99%

“…Thus, as a function of the ligament length

L

, the specific work of fracture

w_{f}

can be plotted using eq. , where

w_{e}

and

β \cdot w_{p}

can be determined by intercept with the

w_{f}

axis for

L = 0

and the slope obtained by its linear regression …”

Section: Materials and Test Rate Effect For Standard Specimensmentioning

confidence: 99%

“…The SPT specimens were tested once the pre‐notch was achieved. The tests were conducted at room temperature using a punch diameter of

d_{p} = 2.5 mm

and the hole in the lower die had a diameter of

D_{d} = 4 mm

and a fillet radius of

r = 0.5 mm

(Figure ) . For the selection of the two test rates used in this research, the rate usually employed in the SPT was taken into account.…”

Section: Ewf For Pre‐notched Spt Specimensmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of the effect of the test rate on polymer essential work of fracture parameters for the small punch test

Cuesta¹,

Alegre²

2016

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…We propose, as an alternative to the DDEN-T specimen, the use of the deeply double-edge notched small punch (DDEN-SP) samplessee Figure 3. The ability of the Small Punch Test (SPT) in measuring the EWF parameters is examined by modifying the standard SPT specimen so as to mimic the conditions of the DDEN-T experiment [27]. The main enhancement is the introduction of two side notches.…”

Section: Experimental Testsmentioning

confidence: 99%

The Essential Work of Fracture parameters for 3D printed polymer sheets

et al. 2019

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Additive manufacturing is becoming increasingly popular in academia and industry.Accordingly, there has been a growing interest in characterizing 3D printed samples to determine their structural integrity behaviour. We employ the Essential Work of Fracture (EWF) to investigate the mechanical response of polymer sheets obtained through additive manufacturing. Our goal is twofold; first, we aim at gaining insight into the role of fibre reinforcement on the fracture resistance of additively manufactured polymer sheets. Deeply double-edge notched tensile (DDEN-T) tests are conducted on four different polymers: Onyx, a crystalline, nylon-reinforced polymer, and three standard polymers used in additive manufacturing -PLA, PP and ABS. Results show that fibrereinforcement translates into a notable increase in fracture resistance, with the fracture energy of Onyx being an order of magnitude higher than that reported for non-reinforced polymers. On the other hand, we propose the use of a miniature test specimen, the deeply double-edge notched small punch specimens (DDEN-SP), to characterize the mechanical response using a limited amount of material. The results obtained exhibit good alignment with the DDEN-T data, suggesting the suitability of the DDEN-SP test for measuring fracture properties of additively manufactured polymers in a cost-effective manner.

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“…The essential work of fracture method (EWF) has been used for the examination of fracture characterization of ductile polymers, related blends and composites . For each ligament length ( l ), at least four double edge notched tension (DENT) specimens were prepared from the PP/EPDM and FSP sheets by compression molding according to standard ISO 293.…”

Section: Characterization and Testingmentioning

confidence: 99%

Effect of process parameters on fracture toughness of PP/EPDM/nanoclay nanocomposite fabricated by novel method of heat assisted Friction stir processing

2016

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Thermoplastic elastomeric nanocomposites due to their excellent mechanical, thermal, and chemical properties have a wide application in airplane, shipbuilding, and automotive industries and medical apparatus. Friction stir processing (FSP) is a novel technique for the fabrication of composites, nanocomposites and microstructural modifications. In this paper, polypropylene/ethylene-propylene-diene monomer (PP/EPDM) nanocomposite with 5 wt% nanoclay are fabricated by FSP to determine the effect of process parameters such as tool rotational speed, traverse speed, shoulder temperature, and number of passes on total work of fracture of this nanocomposite. Response surface methodology (RSM) and Box-Behnken design were used to develop a mathematical model relating the process parameters to the total work of fracture. The results show that the total work of fracture increased with increasing the rotational speed and number of passes and decreasing the shoulder temperature. A maximum total work of fracture of 50.3 N/mm was obtained at traverse speed of 42 mm/min when other parameters were at their center level. The maximum total work of fracture of 61.8 N/mm is achieved at rotational speed of 1,200 rpm, traverse speed of 40 mm/min, shoulder temperature of 1008C, and number of passes of 3. POLYM.

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New fracture characterization in polymer miniature specimens based on the essential work of fracture

Cited by 4 publications

References 21 publications

Analysis of the effect of the test rate on polymer essential work of fracture parameters for the small punch test

Analysis of the effect of the test rate on polymer essential work of fracture parameters for the small punch test

The Essential Work of Fracture parameters for 3D printed polymer sheets

Effect of process parameters on fracture toughness of PP/EPDM/nanoclay nanocomposite fabricated by novel method of heat assisted Friction stir processing

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