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Application of fracture mechanics for the characterization of poly(vinyl chloride) pipes. II. Evaluation of a ring-type specimen for fracture mechanics testing
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2021-07-28 , DOI: 10.1002/vnl.21852 Antonio Rodolfo 1, 2 , Vanderley M. John 2
Journal of Vinyl and Additive Technology ( IF 3.8 ) Pub Date : 2021-07-28 , DOI: 10.1002/vnl.21852 Antonio Rodolfo 1, 2 , Vanderley M. John 2
Affiliation
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An unplasticized poly(vinyl chloride) (U-PVC) pipe sample used in infrastructure applications in Brazil (nominal diameter DN 100, outside diameter 110 mm) was evaluated according to different fracture mechanics methodologies, including essential work of fracture (EWF) and other fracture toughness parameters such as the stress intensity factor 
and plane strain energy release rate 
. This pipe sample was also tested for the quality of processing (degree of gelation) via differential scanning calorimetry (DSC) and tensile strength. The comparative evaluation of different specimen configurations—curved specimens in three-point bending (CTPB) and full rings in tension (SNRT), in thicknesses varying from 5 to 30 mm, showed initial evidence of the suitability of ring-type specimens for the evaluation of EWF and 
. Results also indicate that the full ring geometry, at least in the present experimental setup, presents some drawbacks probably due to the storage of large amounts of elastic energy throughout the test. This fact leads to relevant deviations in both load–displacement behavior and results for strain energy release rate (
), and the results found here will guide future research using full and split rings in different loading modes and improved experimental setups. It was also confirmed that the value of 
, determined by a modified Charpy test, is independent of the type of specimen tested, as long as the test mode and specimen width are the same. Both the experimental value of 
and the estimated value for the plane strain stress intensity factor (
) showed excellent agreement with values reported for other U-PVC compositions.
中文翻译：
断裂力学在聚（氯乙烯）管道表征中的应用。二、用于断裂力学测试的环形试样的评估
根据不同的断裂力学方法，包括基本断裂功 (EWF) 和其他断裂韧性参数，如应力强度因子和平面应变能释放率。还通过差示扫描量热法 (DSC) 和拉伸强度测试了该管材样品的加工质量（凝胶化程度）。对不同试样配置的比较评估——三点弯曲 (CTPB) 弯曲试样和全环拉伸试样 (SNRT)，厚度从 5 到 30 毫米不等，显示了环形试样适用于评估的初步证据EWF 和. 结果还表明，至少在目前的实验装置中，全环几何结构存在一些缺点，这可能是由于在整个测试过程中存储了大量弹性能量。这一事实导致载荷-位移行为和应变能释放率 ( ) 的结果出现相关偏差，此处发现的结果将指导未来在不同载荷模式下使用全环和开口环以及改进实验设置的研究。还证实，由改进的夏比试验确定的 值与所测试的试样类型无关，只要试验模式和试样宽度相同。平面应变应力强度因子的实验值和估计值（) 与其他 U-PVC 组合物报告的值非常吻合。
更新日期：2021-07-28
and plane strain energy release rate . This pipe sample was also tested for the quality of processing (degree of gelation) via differential scanning calorimetry (DSC) and tensile strength. The comparative evaluation of different specimen configurations—curved specimens in three-point bending (CTPB) and full rings in tension (SNRT), in thicknesses varying from 5 to 30 mm, showed initial evidence of the suitability of ring-type specimens for the evaluation of EWF and . Results also indicate that the full ring geometry, at least in the present experimental setup, presents some drawbacks probably due to the storage of large amounts of elastic energy throughout the test. This fact leads to relevant deviations in both load–displacement behavior and results for strain energy release rate (), and the results found here will guide future research using full and split rings in different loading modes and improved experimental setups. It was also confirmed that the value of , determined by a modified Charpy test, is independent of the type of specimen tested, as long as the test mode and specimen width are the same. Both the experimental value of and the estimated value for the plane strain stress intensity factor () showed excellent agreement with values reported for other U-PVC compositions.
中文翻译：
断裂力学在聚（氯乙烯）管道表征中的应用。二、用于断裂力学测试的环形试样的评估
根据不同的断裂力学方法，包括基本断裂功 (EWF) 和其他断裂韧性参数，如应力强度因子
和平面应变能释放率。还通过差示扫描量热法 (DSC) 和拉伸强度测试了该管材样品的加工质量（凝胶化程度）。对不同试样配置的比较评估——三点弯曲 (CTPB) 弯曲试样和全环拉伸试样 (SNRT)，厚度从 5 到 30 毫米不等，显示了环形试样适用于评估的初步证据EWF 和. 结果还表明，至少在目前的实验装置中，全环几何结构存在一些缺点，这可能是由于在整个测试过程中存储了大量弹性能量。这一事实导致载荷-位移行为和应变能释放率 ( ) 的结果出现相关偏差，此处发现的结果将指导未来在不同载荷模式下使用全环和开口环以及改进实验设置的研究。还证实，由改进的夏比试验确定的 值与所测试的试样类型无关，只要试验模式和试样宽度相同。平面应变应力强度因子的实验值和估计值（) 与其他 U-PVC 组合物报告的值非常吻合。
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