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Investigation by Digital Image Correlation of Mixed-Mode I and II Fracture Behavior of Polymeric IASCB Specimens with Additive Manufactured Crack-Like Notch

機(jī)譯：聚合物IASCB標(biāo)本的混合模式I和II斷裂行為的數(shù)字圖像相關(guān)性研究添加制造的裂紋槽

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In this work, the fracture mechanics properties of polyamide (PA) specimens manufactured by the selective laser sintering (SLS) technology are investigated, in which an embedded crack-like notch was inserted in the design and produced during the additive manufacturing (AM) phase. To cover a wide variety of mode I/II mixity levels, the inclined asymmetrical semicircular specimen subjected to three points loading (IASCB) was employed. The investigation was carried out by analyzing the full displacement field in the proximity of the crack tip by means of the digital image correlation (DIC) technique. To characterize the material, which exhibits a marked elastic-plastic behavior, the quantity J-integral was evaluated by two different methods: the first one exploits the full fields measured by the DIC, whereas the second one exploits the experimental load–displacement curves along with FEM analysis. The DIC methodology was experimentally validated and proposed as an alternative method to evaluate the J-integral. It is especially suited for conditions in which it is not possible to use the conventional LDC method due to complex and possibly unknown loading conditions. Furthermore, results showed that the AM technique could be used effectively to induce cracks in this type of material. These two aspects together can lead to both a simplification of the fracture characterization process and to the possibility of dealing with a wider number of practical, real-world scenarios. Indeed, because of the nature of the additive manufacturing process, AM crack-like notches can be sintered even having complex geometry, being three-dimensional and/or inside the tested structure.
機(jī)譯：在這項(xiàng)工作中，研究了通過(guò)選擇性激光燒結(jié)（SLS）技術(shù)制造的聚酰胺（PA）樣本的裂縫力學(xué)性質(zhì)，其中在設(shè)計(jì)中插入了嵌入的裂紋狀凹口，并在添加劑制造期間產(chǎn)生。為了覆蓋各種模式I / II的混合水平，采用傾斜的不對(duì)稱半周標(biāo)本進(jìn)行三分載荷（IASCB）。通過(guò)數(shù)字圖像相關(guān)（DIC）技術(shù)通過(guò)分析裂紋尖端接近的全位移場(chǎng)進(jìn)行研究。為了表征呈現(xiàn)標(biāo)記的彈性塑性行為的材料，通過(guò)兩種不同的方法評(píng)估數(shù)量J-Integral：第一個(gè)利用DIC測(cè)量的完整場(chǎng)，而第二個(gè)是利用實(shí)驗(yàn)負(fù)載 - 位移曲線用有限元分析。 DIC方法是通過(guò)實(shí)驗(yàn)驗(yàn)證的，并提出作為評(píng)估J-Intional的替代方法。它特別適用于由于復(fù)雜和可能未知的負(fù)載條件而無(wú)法使用傳統(tǒng)的LDC方法的條件。此外，結(jié)果表明，AM技術(shù)可以有效地用于誘導(dǎo)這種類型材料的裂縫。這兩個(gè)方面的共同可能導(dǎo)致骨折表征過(guò)程的簡(jiǎn)化以及處理更廣泛的實(shí)際，現(xiàn)實(shí)世界場(chǎng)景的可能性。實(shí)際上，由于添加劑制造過(guò)程的性質(zhì)，濕裂縫的凹口可以燒結(jié)甚至具有復(fù)雜的幾何形狀，是三維和/或測(cè)試結(jié)構(gòu)內(nèi)的三維和/或內(nèi)部。

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