Data for "Characterization of early-age elastic-plastic properties of 3D printed materials using indentation testing"

This dataset contains the experimental data used in the paper entitled “Characterization of early‑age elastic–plastic properties of 3D printed materials using indentation testing.” The data was collected across three concrete printing sessions, during which a printable mortar was sampled directly from the printing system and subsequently characterized. The dataset includes both in‑line process measurements and results from the off‑line mechanical tests used to determine the early‑age elastic-plastic properties of the material. Across all three printing sessions, flat punch indentation tests were conducted on hemispherical samples to derive the elastic modulus, cohesion, and internal friction angle of the printable material. Besides, during two sessions, unconfined compression tests were conducted on cylindrical specimens to validate the developed indentation test. As a quality‑control measure, ultrasonic wave transmission tests were carried out during all printing sessions. A detailed description of the data per session is provided below. Session 1: Session one contains the flat punch indentation tests that were performed to study the sample size effect. Three different hemispherical sample sizes were examined, with diameters of 98, 123, and 145 mm. These tests were used to determine how boundary effects and plastic slip at the container wall influence the indentation response. Session 2: Session two contains the flat punch indentation tests used to study the evolution of the material’s elastic modulus, cohesion, and internal friction angle. This session also includes unconfined compression tests (UCTs), whose results provide a direct comparison and validation of the indentation test outcomes. Session 3: Session three contains additional flat punch indentation tests and UCTs conducted using a lower loading rate to assess its influence on the characterized material properties. In this session, temperature measurements were conducted on multiple samples to analyze the effect of hydration heat release on early‑age mechanical behavior. All data is described following the 3DCP.data framework of Eindhoven University of Technology.本数据集包含发表于论文《利用压痕测试表征3D打印材料的早期弹塑性性能》中的全部实验数据。数据采集自三次混凝土打印作业，作业期间直接从打印系统中取样获取可打印砂浆，并对其开展性能表征。数据集涵盖在线工艺测量数据，以及用于测定该材料早期弹塑性性能的离线力学测试结果。 三次打印作业中，均对半球形试样开展平压头压痕测试，以推导该打印材料的弹性模量、黏聚力与内摩擦角。此外，其中两次作业还针对圆柱形试样开展了无侧限抗压试验（Unconfined Compression Tests，以下简称UCT），以验证所建立的压痕测试方法。作为质量控制手段，所有打印作业期间均实施了超声波透射测试。 下文将按作业批次逐一详细说明各数据集内容。 作业1：本次作业包含为研究试样尺寸效应而开展的平压头压痕测试。本次测试共设置三种不同直径的半球形试样，直径分别为98 mm、123 mm与145 mm。该系列测试用于探究容器壁处的边界效应与塑性滑移对压痕响应的影响规律。 作业2：本次作业包含用于研究材料弹性模量、黏聚力及内摩擦角演化规律的平压头压痕测试。本次作业还包含无侧限抗压试验（Unconfined Compression Tests，UCT），其测试结果可直接与压痕测试结果进行对比验证。 作业3：本次作业包含额外的平压头压痕测试与无侧限抗压试验，本次试验采用更低的加载速率，以评估加载速率对表征得到的材料性能的影响。本次作业还针对多个试样开展了温度测量，以分析水化热释放对材料早期力学行为的影响。 所有数据均遵循埃因霍温理工大学的3DCP.data数据框架进行规范描述。