ASTM D1621 刚性多孔塑料的压缩性能

ASTM D1621 testing

ASTM D1621 outlines the testing procedure for determining the compressive properties of rigid cellular materials, particularly expanded plastics. Rigid cellular, or foamed, plastics are manufactured in different forms for a variety of construction-related applications. Properties common to cellular plastic include thermal insulation (heat loss or fire protection), sound absorption, high strength-to-weight ratio, and earthquake resistance. The properties possessed by any given cellular plastic are a product of its resin, its cellular structure (open vs. closed), and its density. Material properties reported during ASTM D1621 testing include compression strength, strain at compressive strength, yield points, and if requested, compressive modulus.

Testing System

Depending on the maximum expected forces, ASTM D695 can be performed on either a single column or dual column universal testing machine such as those available in Instron's 6800 and 3400 Series.




ASTM D1621 Test Setup
1)3400 Series Universal Testing System
2)Bluehill Universal Software
3)2530 Series Load Cell
4)2501 Series Compression Platens

 

ASTM D1621 test setup
Platens and Accessories

The preferred specimen dimensions for ASTM D1621 testing are a square or circular cross-sectional area between 4 and 36 square inches and a height between 1 inch and the specimen’s width (or diameter). Note the dimensional differences between a D1621 and D695 specimen, which are both ATSM compression test standards for plastic materials. Compression platens with integral spherical seats are ideal for ensuring platen to platen parallelism, which is a requirement of the standard. Depending on your application, the following are commonly used for ASTM D1621 testing:




ASTM D1621 Accessories
1)Self-Aligning Spherical Seat
2)2601-04x Series LVDT

 

ASTM D1621
Helpful Tips and Tricks
  • Compression platens with integral spherical seats are ideal for ensuring platen to platen parallelism, which is a requirement of the standard. The self-aligning nature of this fixture will maximize the contact area between the platen and the specimen.
  • When measuring compressive displacement, ASTM D1621-16 allows for measurement using direct compression platen displacement or via crosshead extension by eliminating the effects of system compliance. If direct strain measurement is used, a displacement transducer is required to measure the distance between the upper and lower platen. The transducer must also be verified in conformance with ASTM E83 Class C or better. Instron's 2601-04x series LVDTs can mount directly on the 2501 series compression platens and are designed to measure displacement directly from the platens. To measure displacement via crosshead extension, Bluehill Universal testing software can do an automatic compliance correction to eliminate system compliance from the test curve. Please review the compliance correction whitepaper for more details. 
  • If reporting the modulus calculation, make sure the extensometer and load cell are both verified in the range that the calculation is being made. Labs sometimes unknowingly report calculations outside of the verified range of their devices.
  • It is important to review ASTM D1621-16 in order to fully understand the test setup, procedure, and results requirements.
Related Content

6800 系列高级测试系统宣传册

Instron 6800 系列通用测试系统可提供无与伦比的准确性和可靠性。6800 系列以专利申请中的操作员保障系统架构为依托,架构采用全新的 Smart-Close 空气套件并具有碰撞缓解功能,使得材料测试比以往任何时候都更简单、更智能、更安全。

3400 系列 - 经济适用的测试解决方案

Instron 3400 系列通用测试系统用于拉伸、压缩、弯曲和其他材料性能测试。

Bluehill Universal 宣传册

Bluehill Universal 软件从头开始构建,旨在提供触摸互动和直观的用户体验。使用诸如预装测试方法、几秒钟内快速测试、增强的数据导出以及 Instron Connect(一种全新功能,可提供与服务的直接通信联系)等功能,发现更简单、更智能的测试。 Bluehill 2 和 Bluehill 3 等以前版本软件的用户可以轻松升级到最新版本的 Bluehill。

S571x 系列压缩压盘,带球面底座

这些易于安装的压缩压盘是经过精密加工的工装,专为在测试过程中实现压缩载荷的均匀分布而设计。压缩载荷柱由带有球面底座的上压盘和刚性下压盘组成,安装在通用测试机的加载轴上。

2501 系列压缩压盘

这些易于安装的压缩压盘是经过精密加工的工装,专为在测试过程中实现压缩载荷的均匀分布而设计。

2601 系列 LVDT 偏转传感器

2601 系列线性差动变压器 (LVDT) 位移传感器是测量负载机架位移的测量设备。