Enhancing the performance of the T-peel test for thin and flexible adhered laminates

Abstract

Symmetrically bonded thin and flexible T-peel specimens, when tested on vertical travel machines, can be subject to significant gravitational loading; with the associated asymmetry and mixed-mode failure during peeling. This can cause erroneously high experimental peel forces to be recorded which leads to uncertainty in estimating interfacial fracture toughness and failure mode.To overcome these issues, a mechanical test fixture has been designed for use with vertical test machines, that supports the unpeeled portion of the test specimen and suppresses parasitic loads due to gravity from affecting the peel test. The mechanism, driven by the test machine cross-head, moves at one-half of the velocity of the cross-head such that the unpeeled portion always lies in the plane of the instantaneous center of motion. Several specimens such as bonded polymeric films, laminates, and commercial tapes were tested with and without the fixture, and the importance of the proposed T-peel procedure has been demonstrated a . Keywords

Mussel-Inspired Injectable Hydrogel Adhesive Formed under Mild Conditions Features Near-Native Tissue Properties

“…Tension was applied horizontally to minimize the influence of gravity. 67 As expected, CA shows the highest adhesion energy (Figure 6B-C).…”

Realization of Micropatterned, Narrow Line-Width Ni–Cu–Sn Front Contact Grid Pattern Using Maskless Direct-Write Lithography for Industrial Silicon Solar Cells

“…The nickel seed layer deposited on the silicon solar cell was mounted on the bottom chuck as shown in Figure e. The Scotch 3M 401+ tape was glued over the finger lines and busbar of the solar cell, and the peel force test was carried out at an angle of 90° as per the ASTM D6862 standard . The peeling rate was kept constant at 100 mm/min.…”

“…The Scotch 3M 401+ tape was glued over the finger lines and busbar of the solar cell, and the peel force test was carried out at an angle of 90°a s per the ASTM D6862 standard. 36 The peeling rate was kept constant at 100 mm/min. The average adhesion strength was found to be 2.4 N/mm (Figure 7f), which indicates better adhesion as compared to the commercial silver metal contact (average peel force strength of 1.5 N/mm).…”

Deformation‐induced bonding of polymer films below the glass transition temperature

“…Stacks of six film layers, with each layer approximately 100 μm thick, were passed through a roll-bonding machine to induce bulk plastic deformation. A symmetric T-peel test 28 was carried out to estimate the mode-I fracture toughness (G c ), which represents the work done per unit area in debonding the plastically-bonded interface. A schematic illustration of the roll-bonding process and peel-test is shown in Figure 4.…”

“…[22][23][24][25] Bonding was achieved by imposing a plastic deformation in rolling experiments, and the strengths of the bonded interfaces were determined by estimating the interfacial fracture toughness through peel-tests. 28 Building on these previous studies, in this work we followed a similar methodology to investigate solid-state, deformation-induced bonding results in blends of organic polymers consisting of films of HPMC and polyvinyl alcohol (PVA) products. PEG was used as a plasticizer for property modification, that is, to tailor the brittleness and ductility of the polymer films.…”